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Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating activities:      
Net cash provided by operating activities $ 2,119 $ 1,898 $ 434
Investing activities:      
Purchases of investments (2,713) (670) (2,536)
Proceeds from sales and maturities of investments 1,329 1,097 2,302
Purchases of property, equipment and capitalized software (77) (74) (57)
Other, net (63) 2 (2)
Net cash (used in) provided by investing activities (1,653) (400) (293)
Financing activities:      
Proceeds from senior notes offerings, net of issuance costs 740 1,429 0
Repayment of senior notes (723) (338) 0
Common stock purchases (128) (606) (47)
Common stock withheld to settle employee tax obligations (53) (8) (7)
Repayment of term loan facility 0 (600) 0
Proceeds from borrowings under term loan facility 0 380 220
Cash paid for partial termination of warrants 0 (30) (514)
Cash paid for partial settlement of conversion option 0 (27) (578)
Cash received for partial settlement of call option 0 27 578
Repayment of principal amount of convertible notes 0 (12) (240)
Other, net 1 2 29
Net cash (used in) provided by financing activities (183) 217 (559)
Net increase (decrease) in cash and cash equivalents, and restricted cash and cash equivalents 283 1,715 (418)
Cash and cash equivalents, and restricted cash and cash equivalents at beginning of period 4,223 2,508 2,926
Cash and cash equivalents, and restricted cash and cash equivalents at end of period 4,506 4,223 2,508
Parent Company      
Operating activities:      
Net cash provided by operating activities 60 67 71
Investing activities:      
Capital contributions to subsidiaries (440) (107) (43)
Dividends received from subsidiaries 564 635 1,373
Purchases of investments (27) (188) (152)
Proceeds from sales and maturities of investments 21 282 93
Purchases of property, equipment and capitalized software (70) (74) (56)
Net cash paid in business combinations (263) (1,028) 0
Change in amounts due to/from affiliates 40 (68) 38
Other, net (3) 3 1
Net cash (used in) provided by investing activities (178) (545) 1,254
Financing activities:      
Proceeds from senior notes offerings, net of issuance costs 740 1,429 0
Repayment of senior notes (723) (338) 0
Common stock purchases (128) (606) (47)
Common stock withheld to settle employee tax obligations (53) (8) (7)
Contingent consideration liabilities settled (20) 0 0
Repayment of term loan facility 0 (600) 0
Proceeds from borrowings under term loan facility 0 380 220
Cash paid for partial termination of warrants 0 (30) (514)
Cash paid for partial settlement of conversion option 0 (27) (578)
Cash received for partial settlement of call option 0 27 578
Repayment of principal amount of convertible notes 0 (12) (240)
Other, net 1 2 29
Net cash (used in) provided by financing activities (183) 217 (559)
Net increase (decrease) in cash and cash equivalents, and restricted cash and cash equivalents (301) (261) 766
Cash and cash equivalents, and restricted cash and cash equivalents at beginning of period 575 836 70
Cash and cash equivalents, and restricted cash and cash equivalents at end of period $ 274 $ 575 $ 836