Annual report pursuant to Section 13 and 15(d)

Medical Claims Liability - Schedule of change In medical claims liability (Details)

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Medical Claims Liability - Schedule of change In medical claims liability (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance, January 1 $ 6,831 $ 4,286 $ 3,929
Less: reinsurance recoverable 27 18 5
Balance, January 1, net 6,804 4,268 3,924
Acquisitions 59 1,204 0
Less: acquired reinsurance recoverable 0 8 0
Incurred related to:      
Current year 59,539 46,484 38,225
Prior years (677) (427) (374)
Total incurred 58,862 46,057 37,851
Paid related to:      
Current year 52,453 41,161 34,196
Prior years 5,819 3,556 3,311
Total paid 58,272 44,717 37,507
Balance at December 31, net 7,453 6,804 4,268
Plus: reinsurance recoverable 20 27 18
Balance, December 31 $ 7,473 $ 6,831 $ 4,286