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Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Operating activities: |  |  |
Net cash provided by operating activities | $ 644 | $ 1,662 | $ 773
Investing activities: |  |  |
Purchases of investments | (1,132) | (1,433) | (1,913)
Proceeds from sales and maturities of investments | 1,111 | 772 | 1,398
Purchases of property, equipment and capitalized software | (100) | (84) | (91)
Other, net | 1 | 4 | (50)
Net cash used in investing activities | (464) | (744) | (790)
Financing activities: |  |  |
Common stock purchases | (1,000) | 0 | (400)
Proceeds from senior notes offerings, net of issuance costs | 740 | 0 | 0
Proceeds from borrowings under credit facility | 300 | 0 | 0
Repayment of credit facility | (300) | 0 | 0
Common stock withheld to settle employee tax obligations | (57) | (60) | (54)
Contingent consideration liabilities settled | 0 | 0 | (20)
Other, net | (30) | 2 | 33
Net cash used in financing activities | (347) | (58) | (441)
Net (decrease) increase in cash and cash equivalents, and restricted cash and cash equivalents | (167) | 860 | (458)
Cash and cash equivalents, and restricted cash and cash equivalents at beginning of period | 4,908 | 4,048 | 4,506
Cash and cash equivalents, and restricted cash and cash equivalents at end of period | 4,741 | 4,908 | 4,048
Parent Company |  |  |
Operating activities: |  |  |
Net cash provided by operating activities | 63 | 81 | 119
Investing activities: |  |  |
Capital contributions to subsidiaries | (490) | (221) | (159)
Dividends received from subsidiaries | 997 | 705 | 668
Purchases of investments | 0 | (2) | (29)
Proceeds from sales and maturities of investments | 17 | 1 | 49
Purchases of property, equipment and capitalized software | (97) | (79) | (86)
Net cash paid in business combinations | (489) | (74) | 0
Change in amounts due to/from affiliates | 60 | 5 | (69)
Other, net | 6 | 7 | 3
Net cash used in investing activities | 4 | 342 | 377
Financing activities: |  |  |
Common stock purchases | (1,000) | 0 | (400)
Proceeds from senior notes offerings, net of issuance costs | 740 | 0 | 0
Proceeds from borrowings under credit facility | 300 | 0 | 0
Repayment of credit facility | (300) | 0 | 0
Common stock withheld to settle employee tax obligations | (57) | (60) | (54)
Contingent consideration liabilities settled | 0 | 0 | (20)
Other, net | (30) | 2 | 33
Net cash used in financing activities | (347) | (58) | (441)
Net (decrease) increase in cash and cash equivalents, and restricted cash and cash equivalents | (280) | 365 | 55
Cash and cash equivalents, and restricted cash and cash equivalents at beginning of period | 694 | 329 | 274
Cash and cash equivalents, and restricted cash and cash equivalents at end of period | $ 414 | $ 694 | $ 329

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