Quarterly report pursuant to Section 13 or 15(d)

Medical Claims Liability - Schedule of Change in Medical Claims Liability (Details)

v3.19.1
Medical Claims Liability - Schedule of Change in Medical Claims Liability (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Balance, January 1 $ 6,831 $ 4,286
Less: Reinsurance recoverable 27 18
Balance, January 1, net 6,804 4,268
Acquisitions and purchase accounting adjustments 6 0
Incurred related to:    
Current year 14,376 10,302
Prior years (494) (263)
Total incurred 13,882 10,039
Paid related to:    
Current year 8,771 6,579
Prior years 4,560 2,970
Total paid 13,331 9,549
Balance at March 31, net 7,361 4,758
Plus: Reinsurance recoverable 20 13
Balance, March 31 $ 7,381 $ 4,771