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Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating activities: |  |  |
Net cash provided by operating activities | $ (314) | $ 804 | $ 673
Investing activities: |  |  |
Capital contributions to subsidiaries |  |  | 0
Dividends received from subsidiaries | 0 | 0 | 0
Purchases of investments | (1,444) | (2,697) | (1,929)
Proceeds from sales and maturities of investments | 2,445 | 1,759 | 1,966
Purchases of property, equipment and capitalized software | (30) | (86) | (176)
Net cash received from sale of subsidiaries | 190 | 0 | 0
Change in amounts due to/from affiliates | 0 | 0 | 0
Other, net | (18) | (38) | (19)
Net cash provided by (used in) investing activities | 1,143 | (1,062) | (206)
Financing activities: |  |  |
Repayment of credit facility | (300) | 0 | 0
Cash paid for partial settlement of 1.125% Conversion Option | (623) | 0 | 0
Cash received for partial settlement of 1.125% Call Option | 623 | 0 | 0
Cash paid for partial termination of 1.125% Warrants | (549) | 0 | 0
Proceeds from senior notes offerings, net of issuance costs | 0 | 325 | 0
Proceeds from borrowings under credit facility | 0 | 300 | 0
Other, net | 18 | 11 | 19
Net cash (used in) provided by financing activities | (1,193) | 636 | 19
Net (decrease) increase in cash, cash equivalents, and restricted cash and cash equivalents | (364) | 378 | 486
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period | 3,290 | 2,912 | 2,426
Cash, cash equivalents, and restricted cash and cash equivalents at end of period | 2,926 | 3,290 | 2,912
Parent Company |  |  |
Operating activities: |  |  |
Net cash provided by operating activities | 118 | 166 | 55
Investing activities: |  |  |
Capital contributions to subsidiaries | (145) | (370) | (386)
Dividends received from subsidiaries | 298 | 286 | 101
Purchases of investments | (136) | (331) | (115)
Proceeds from sales and maturities of investments | 388 | 156 | 188
Purchases of property, equipment and capitalized software | (22) | (67) | (125)
Net cash received from sale of subsidiaries | 242 | 0 | 0
Change in amounts due to/from affiliates | 6 | (49) | (18)
Other, net | 0 | 0 | 6
Net cash provided by (used in) investing activities | 631 | (375) | (349)
Financing activities: |  |  |
Repayment of credit facility | (300) | 0 | 0
Cash paid for partial settlement of 1.125% Conversion Option | (623) | 0 | 0
Cash received for partial settlement of 1.125% Call Option | 623 | 0 | 0
Cash paid for partial termination of 1.125% Warrants | (549) | 0 | 0
Proceeds from senior notes offerings, net of issuance costs | 0 | 325 | 0
Proceeds from borrowings under credit facility | 0 | 300 | 0
Other, net | 19 | 11 | 20
Net cash (used in) provided by financing activities | (1,192) | 636 | 20
Net (decrease) increase in cash, cash equivalents, and restricted cash and cash equivalents | (443) | 427 | (274)
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period | 513 | 86 | 360
Cash, cash equivalents, and restricted cash and cash equivalents at end of period | 70 | 513 | 86
1.125% Notes |  |  |
Financing activities: |  |  |
Repayment of principal amount of Notes | (298) | 0 | 0
1.125% Notes | Parent Company |  |  |
Financing activities: |  |  |
Repayment of principal amount of Notes | (298) | 0 | 0
1.625% Notes |  |  |
Financing activities: |  |  |
Repayment of principal amount of Notes | (64) | 0 | 0
1.625% Notes | Parent Company |  |  |
Financing activities: |  |  |
Repayment of principal amount of Notes | $ (64) | $ 0 | $ 0

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