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Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating activities: |  |  |
Net cash provided by operating activities | $ 1,890 | $ 427 | $ (314)
Investing activities: |  |  |
Purchases of investments | (670) | (2,536) | (1,444)
Proceeds from sales and maturities of investments | 1,097 | 2,302 | 2,445
Purchases of property, equipment and capitalized software | (74) | (57) | (30)
Net cash received from sale of subsidiaries | 0 | 0 | 190
Other, net | 2 | (2) | (18)
Net cash (used in) provided by investing activities | (400) | (293) | 1,143
Financing activities: |  |  |
Proceeds from senior notes offerings, net of issuance costs | 1,429 | 0 | 0
Common stock purchases | (606) | (47) | 0
Repayment of term loan facility | (600) | 0 | 0
Proceeds from borrowings under term loan facility | 380 | 220 | 0
Repayment of senior notes | (338) | 0 | 0
Cash paid for partial termination of warrants | (30) | (514) | (549)
Cash paid for partial settlement of conversion option | (27) | (578) | (623)
Cash received for partial settlement of call option | 27 | 578 | 623
Repayment of principal amount of convertible notes | (12) | (240) | (362)
Repayment of credit facility | 0 | 0 | (300)
Other, net | 2 | 29 | 18
Net cash provided by (used in) financing activities | 225 | (552) | (1,193)
Net increase (decrease) in cash and cash equivalents, and restricted cash and cash equivalents | 1,715 | (418) | (364)
Cash and cash equivalents, and restricted cash and cash equivalents at beginning of period | 2,508 | 2,926 | 3,290
Cash and cash equivalents, and restricted cash and cash equivalents at end of period | 4,223 | 2,508 | 2,926
Parent Company |  |  |
Operating activities: |  |  |
Net cash provided by operating activities | 59 | 64 | 118
Investing activities: |  |  |
Capital contributions to subsidiaries | (107) | (43) | (145)
Dividends received from subsidiaries | 635 | 1,373 | 298
Purchases of investments | (188) | (152) | (136)
Proceeds from sales and maturities of investments | 282 | 93 | 388
Purchases of property, equipment and capitalized software | (74) | (56) | (22)
Net cash paid in business combinations | (1,028) | 0 | 0
Net cash received from sale of subsidiaries | 0 | 0 | 242
Change in amounts due to/from affiliates | (68) | 38 | 6
Other, net | 3 | 1 | 0
Net cash (used in) provided by investing activities | (545) | 1,254 | 631
Financing activities: |  |  |
Proceeds from senior notes offerings, net of issuance costs | 1,429 | 0 | 0
Common stock purchases | (606) | (47) | 0
Repayment of term loan facility | (600) | 0 | 0
Proceeds from borrowings under term loan facility | 380 | 220 | 0
Repayment of senior notes | (338) | 0 | 0
Cash paid for partial termination of warrants | (30) | (514) | (549)
Cash paid for partial settlement of conversion option | (27) | (578) | (623)
Cash received for partial settlement of call option | 27 | 578 | 623
Repayment of principal amount of convertible notes | (12) | (240) | (362)
Repayment of credit facility | 0 | 0 | (300)
Other, net | 2 | 29 | 19
Net cash provided by (used in) financing activities | 225 | (552) | (1,192)
Net increase (decrease) in cash and cash equivalents, and restricted cash and cash equivalents | (261) | 766 | (443)
Cash and cash equivalents, and restricted cash and cash equivalents at beginning of period | 836 | 70 | 513
Cash and cash equivalents, and restricted cash and cash equivalents at end of period | $ 575 | $ 836 | $ 70

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