Annual report pursuant to Section 13 and 15(d)

Condensed Financial Information of Registrant - Condensed Statements Of Cash Flows (Details)

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Condensed Financial Information of Registrant - Condensed Statements Of Cash Flows (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:      
Other operating activities, net $ (25) $ 42 $ (10)
Net cash provided by operating activities 1,483 1,234 1,489
Cash flows from investing activities:      
Purchases of investments (2,575) (3,846) (2,656)
Sales and maturities of investments 1,809 1,991 1,862
Other investing activities, net 0 0 12
Net cash used in investing activities (1,532) (4,585) (1,254)
Cash flows from financing activities:      
Proceeds from the issuance of common stock 0 2,779 0
Proceeds from borrowings 24,721 6,077 1,400
Payments of long-term debt (17,803) (4,083) (1,353)
Common stock repurchases (75) (71) (65)
Contribution from noncontrolling interest 21 0 0
Payments for debt extinguishment (23) 0 0
Debt issue costs (25) (25) (3)
Purchase of noncontrolling interest 0 (74) (66)
Other financing activities, net 16 9 5
Net cash provided by (used in) financing activities 6,832 4,612 (82)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash (2) 0 0
Cash, cash equivalents, and restricted cash and cash equivalents, beginning of period 5,350 4,089 3,936
Cash, cash equivalents, and restricted cash and cash equivalents, end of period 12,131 5,350 4,089
Parent Company      
Cash flows from operating activities:      
Dividends from subsidiaries, return on investment 429 464 292
Other operating activities, net (231) (317) (132)
Net cash provided by operating activities 198 147 160
Cash flows from investing activities:      
Capital contributions to subsidiaries (731) (681) (339)
Purchases of investments (124) (23) (38)
Sales and maturities of investments 0 7 4
Dividends from subsidiaries, return of investment 291 11 28
Investments in acquisitions (302) (4,226) (59)
Intercompany activities 140 215 322
Other investing activities, net 0 0 (1)
Net cash used in investing activities (726) (4,697) (83)
Cash flows from financing activities:      
Proceeds from the issuance of common stock 0 2,778 0
Proceeds from borrowings 24,647 6,014 1,400
Payments of long-term debt (17,778) (4,080) (1,350)
Common stock repurchases (75) (71) (65)
Contribution from noncontrolling interest 21 0 0
Payments for debt extinguishment (23) 0 0
Debt issue costs (25) (25) 0
Purchase of noncontrolling interest 0 (76) (66)
Other financing activities, net 12 10 5
Net cash provided by (used in) financing activities 6,779 4,550 (76)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash 0 0 0
Net increase in cash, cash equivalents, and restricted cash and equivalents 6,251 0 1
Cash, cash equivalents, and restricted cash and cash equivalents, beginning of period 6 6 5
Cash, cash equivalents, and restricted cash and cash equivalents, end of period $ 6,257 $ 6 $ 6