Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.1
Medical Claims Liability - Schedule of Change in Medical Claims Liability (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Balance, January 1 $ 7,473 $ 6,831
Less: Reinsurance recoverable 20 27
Balance, January 1, net 7,453 6,804
Acquisitions and divestitures 3,697 6
Incurred related to:    
Current year 20,866 14,376
Prior years (446) (494)
Total incurred 20,420 13,882
Paid related to:    
Current year 15,147 8,771
Prior years 5,031 4,560
Total paid 20,178 13,331
Balance at March 31, net 11,392 7,361
Plus: Reinsurance recoverable 21 20
Balance, March 31 $ 11,413 $ 7,381