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Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating activities:      
Net cash provided by operating activities $ (314) $ 804 $ 673
Investing activities:      
Capital contributions to subsidiaries     0
Dividends received from subsidiaries 0 0 0
Purchases of investments (1,444) (2,697) (1,929)
Proceeds from sales and maturities of investments 2,445 1,759 1,966
Purchases of property, equipment and capitalized software (30) (86) (176)
Net cash received from sale of subsidiaries 190 0 0
Change in amounts due to/from affiliates 0 0 0
Other, net (18) (38) (19)
Net cash provided by (used in) investing activities 1,143 (1,062) (206)
Financing activities:      
Repayment of credit facility (300) 0 0
Cash paid for partial settlement of 1.125% Conversion Option (623) 0 0
Cash received for partial settlement of 1.125% Call Option 623 0 0
Cash paid for partial termination of 1.125% Warrants (549) 0 0
Proceeds from senior notes offerings, net of issuance costs 0 325 0
Proceeds from borrowings under credit facility 0 300 0
Other, net 18 11 19
Net cash (used in) provided by financing activities (1,193) 636 19
Net (decrease) increase in cash, cash equivalents, and restricted cash and cash equivalents (364) 378 486
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period 3,290 2,912 2,426
Cash, cash equivalents, and restricted cash and cash equivalents at end of period 2,926 3,290 2,912
Parent Company      
Operating activities:      
Net cash provided by operating activities 118 166 55
Investing activities:      
Capital contributions to subsidiaries (145) (370) (386)
Dividends received from subsidiaries 298 286 101
Purchases of investments (136) (331) (115)
Proceeds from sales and maturities of investments 388 156 188
Purchases of property, equipment and capitalized software (22) (67) (125)
Net cash received from sale of subsidiaries 242 0 0
Change in amounts due to/from affiliates 6 (49) (18)
Other, net 0 0 6
Net cash provided by (used in) investing activities 631 (375) (349)
Financing activities:      
Repayment of credit facility (300) 0 0
Cash paid for partial settlement of 1.125% Conversion Option (623) 0 0
Cash received for partial settlement of 1.125% Call Option 623 0 0
Cash paid for partial termination of 1.125% Warrants (549) 0 0
Proceeds from senior notes offerings, net of issuance costs 0 325 0
Proceeds from borrowings under credit facility 0 300 0
Other, net 19 11 20
Net cash (used in) provided by financing activities (1,192) 636 20
Net (decrease) increase in cash, cash equivalents, and restricted cash and cash equivalents (443) 427 (274)
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period 513 86 360
Cash, cash equivalents, and restricted cash and cash equivalents at end of period 70 513 86
1.125% Notes      
Financing activities:      
Repayment of principal amount of Notes (298) 0 0
1.125% Notes | Parent Company      
Financing activities:      
Repayment of principal amount of Notes (298) 0 0
1.625% Notes      
Financing activities:      
Repayment of principal amount of Notes (64) 0 0
1.625% Notes | Parent Company      
Financing activities:      
Repayment of principal amount of Notes $ (64) $ 0 $ 0