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Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating activities:      
Net cash provided by operating activities $ 1,662 $ 773 $ 2,119
Investing activities:      
Purchases of investments (1,433) (1,913) (2,713)
Proceeds from sales and maturities of investments 772 1,398 1,329
Purchases of property, equipment and capitalized software (84) (91) (77)
Other, net 4 (50) (63)
Net cash used in investing activities (744) (790) (1,653)
Financing activities:      
Common stock purchases 0 (400) (128)
Common stock withheld to settle employee tax obligations (60) (54) (53)
Contingent consideration liabilities settled 0 (20) (20)
Proceeds from senior notes offerings, net of issuance costs 0 0 740
Repayment of senior notes 0 0 (723)
Other, net 2 33 1
Net cash used in financing activities (58) (441) (183)
Net increase (decrease) in cash and cash equivalents, and restricted cash and cash equivalents 860 (458) 283
Cash and cash equivalents, and restricted cash and cash equivalents at beginning of period 4,048 4,506 4,223
Cash and cash equivalents, and restricted cash and cash equivalents at end of period 4,908 4,048 4,506
Parent Company      
Operating activities:      
Net cash provided by operating activities 81 119 60
Investing activities:      
Capital contributions to subsidiaries (221) (159) (440)
Dividends received from subsidiaries 705 668 564
Purchases of investments (2) (29) (27)
Proceeds from sales and maturities of investments 1 49 21
Purchases of property, equipment and capitalized software (79) (86) (70)
Net cash paid in business combinations (74) 0 (263)
Change in amounts due to/from affiliates 5 (69) 40
Other, net 7 3 (3)
Net cash used in investing activities 342 377 (178)
Financing activities:      
Common stock purchases 0 (400) (128)
Common stock withheld to settle employee tax obligations (60) (54) (53)
Contingent consideration liabilities settled 0 (20) (20)
Proceeds from senior notes offerings, net of issuance costs 0 0 740
Repayment of senior notes 0 0 (723)
Other, net 2 33 1
Net cash used in financing activities (58) (441) (183)
Net increase (decrease) in cash and cash equivalents, and restricted cash and cash equivalents 365 55 (301)
Cash and cash equivalents, and restricted cash and cash equivalents at beginning of period 329 274 575
Cash and cash equivalents, and restricted cash and cash equivalents at end of period $ 694 $ 329 $ 274