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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
Operating activities:      
Net cash provided by operating activities $ 427 $ (314) $ 804
Investing activities:      
Purchases of investments (2,536) (1,444) (2,697)
Proceeds from sales and maturities of investments 2,302 2,445 1,759
Purchases of property, equipment and capitalized software (57) (30) (86)
Net cash received from sale of subsidiaries 0 190 0
Other, net (2) (18) (38)
Net cash provided by (used in) investing activities (293) 1,143 (1,062)
Financing activities:      
Repayment of principal amount of convertible notes (240) (362) 0
Cash paid for partial settlement of conversion option (578) (623) 0
Cash received for partial settlement of call option 578 623 0
Cash paid for partial termination of warrants (514) (549) 0
Proceeds from borrowings under term loan facility 220 0 0
Common stock purchases (47) 0 0
Repayment of credit facility 0 (300) 0
Proceeds from senior notes offerings, net of issuance costs 0 0 325
Other, net 29 18 11
Net cash (used in) provided by financing activities (552) (1,193) 636
Net (decrease) increase in cash and cash equivalents, and restricted cash and cash equivalents (418) (364) 378
Cash and cash equivalents, and restricted cash and cash equivalents at beginning of period 2,926 3,290 2,912
Cash and cash equivalents at end of period 2,508 2,926 3,290
Parent Company      
Operating activities:      
Net cash provided by operating activities 64 118 166
Investing activities:      
Capital contributions to subsidiaries (43) (145) (370)
Dividends received from subsidiaries 1,373 298 286
Purchases of investments (152) (136) (331)
Proceeds from sales and maturities of investments 93 388 156
Purchases of property, equipment and capitalized software (56) (22) (67)
Net cash received from sale of subsidiaries 0 242 0
Change in amounts due to/from affiliates 38 6 (49)
Other, net 1 0 0
Net cash provided by (used in) investing activities 1,254 631 (375)
Financing activities:      
Repayment of principal amount of convertible notes (240) (362) 0
Cash paid for partial settlement of conversion option (578) (623) 0
Cash received for partial settlement of call option 578 623 0
Cash paid for partial termination of warrants (514) (549) 0
Proceeds from borrowings under term loan facility 220 0 0
Common stock purchases (47) 0 0
Repayment of credit facility 0 (300) 0
Proceeds from senior notes offerings, net of issuance costs 0 0 325
Proceeds from borrowings under credit facility 0 0 300
Other, net 29 19 11
Net cash (used in) provided by financing activities (552) (1,192) 636
Net (decrease) increase in cash and cash equivalents, and restricted cash and cash equivalents 766 (443) 427
Cash and cash equivalents, and restricted cash and cash equivalents at beginning of period 70 513 86
Cash and cash equivalents at end of period $ 836 $ 70 $ 513