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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

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