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Supplemental Condensed Consolidating Financial Information - Cash Flows (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Operating activities: |  |
Net cash provided by operating activities | $ (191) | $ 957
Investing activities: |  |
Purchases of investments | (1,202) | (1,894)
Proceeds from sales and maturities of investments | 2,070 | 1,536
Purchases of property, equipment and capitalized software | (24) | (85)
Capital contributions to subsidiaries | 0 | 0
Dividends from subsidiaries | 0 | 0
Change in amounts due to/from affiliates | 0 | 0
Other, net | (23) | (33)
Net cash provided by (used in) investing activities | 821 | (476)
Financing activities: |  |
Repayment of credit facility | (300) | 0
Cash paid for partial settlement of 1.125% Conversion Option | (477) | 0
Cash received for partial termination of 1.125% Call Option | 477 | 0
Cash paid for partial termination of 1.125% Warrants | (419) | 0
Proceeds from senior notes offerings, net of issuance costs |  | 325
Proceeds from borrowings under credit facility | 0 | 300
Other, net | 7 | 7
Net cash (used in) provided by financing activities | (1,012) | 632
Net increase in cash, cash equivalents, and restricted cash and cash equivalents | (382) | 1,113
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period | 3,290 | 2,912
Cash, cash equivalents, and restricted cash and cash equivalents at end of period | 2,908 | 4,025
Eliminations |  |
Operating activities: |  |
Net cash provided by operating activities | 0 | 0
Investing activities: |  |
Purchases of investments | 0 | 0
Proceeds from sales and maturities of investments | 0 | 0
Purchases of property, equipment and capitalized software | 0 | 0
Capital contributions to subsidiaries | 0 | 0
Dividends from subsidiaries | 0 | 0
Change in amounts due to/from affiliates | 0 | 0
Other, net | 0 | 0
Net cash provided by (used in) investing activities | 0 | 0
Financing activities: |  |
Repayment of credit facility | 0 |
Cash paid for partial settlement of 1.125% Conversion Option | 0 |
Cash received for partial termination of 1.125% Call Option | 0 |
Cash paid for partial termination of 1.125% Warrants | 0 |
Proceeds from senior notes offerings, net of issuance costs |  | 0
Proceeds from borrowings under credit facility |  | 0
Other, net | 0 | 0
Net cash (used in) provided by financing activities | 0 | 0
Net increase in cash, cash equivalents, and restricted cash and cash equivalents | 0 | 0
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period | 0 | 0
Cash, cash equivalents, and restricted cash and cash equivalents at end of period | 0 | 0
Parent Guarantor | Reportable Legal Entities |  |
Operating activities: |  |
Net cash provided by operating activities | 451 | 215
Investing activities: |  |
Purchases of investments | (136) | (331)
Proceeds from sales and maturities of investments | 383 | 148
Purchases of property, equipment and capitalized software | (16) | (67)
Capital contributions to subsidiaries | (122) | (363)
Dividends from subsidiaries | 268 | 136
Change in amounts due to/from affiliates | 70 | (100)
Other, net | 0 | 0
Net cash provided by (used in) investing activities | 447 | (577)
Financing activities: |  |
Repayment of credit facility | (300) |
Cash paid for partial settlement of 1.125% Conversion Option | (477) |
Cash received for partial termination of 1.125% Call Option | 477 |
Cash paid for partial termination of 1.125% Warrants | (419) |
Proceeds from senior notes offerings, net of issuance costs |  | 325
Proceeds from borrowings under credit facility |  | 300
Other, net | 7 | 7
Net cash (used in) provided by financing activities | (1,012) | 632
Net increase in cash, cash equivalents, and restricted cash and cash equivalents | (114) | 270
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period | 513 | 86
Cash, cash equivalents, and restricted cash and cash equivalents at end of period | 399 | 356
Other Guarantors | Reportable Legal Entities |  |
Operating activities: |  |
Net cash provided by operating activities | 1 | 0
Investing activities: |  |
Purchases of investments | 0 | 0
Proceeds from sales and maturities of investments | 0 | 0
Purchases of property, equipment and capitalized software | 0 | 0
Capital contributions to subsidiaries | 0 | 2
Dividends from subsidiaries | 0 | 0
Change in amounts due to/from affiliates | 1 | 0
Other, net | 0 | 0
Net cash provided by (used in) investing activities | 1 | 2
Financing activities: |  |
Repayment of credit facility | 0 |
Cash paid for partial settlement of 1.125% Conversion Option | 0 |
Cash received for partial termination of 1.125% Call Option | 0 |
Cash paid for partial termination of 1.125% Warrants | 0 |
Proceeds from senior notes offerings, net of issuance costs |  | 0
Proceeds from borrowings under credit facility |  | 0
Other, net | 0 | 0
Net cash (used in) provided by financing activities | 0 | 0
Net increase in cash, cash equivalents, and restricted cash and cash equivalents | 2 | 2
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period | 0 | 0
Cash, cash equivalents, and restricted cash and cash equivalents at end of period | 2 | 2
Non-Guarantors | Reportable Legal Entities |  |
Operating activities: |  |
Net cash provided by operating activities | (643) | 742
Investing activities: |  |
Purchases of investments | (1,066) | (1,563)
Proceeds from sales and maturities of investments | 1,687 | 1,388
Purchases of property, equipment and capitalized software | (8) | (18)
Capital contributions to subsidiaries | 122 | 361
Dividends from subsidiaries | (268) | (136)
Change in amounts due to/from affiliates | (71) | 100
Other, net | (23) | (33)
Net cash provided by (used in) investing activities | 373 | 99
Financing activities: |  |
Repayment of credit facility | 0 |
Cash paid for partial settlement of 1.125% Conversion Option | 0 |
Cash received for partial termination of 1.125% Call Option | 0 |
Cash paid for partial termination of 1.125% Warrants | 0 |
Proceeds from senior notes offerings, net of issuance costs |  | 0
Proceeds from borrowings under credit facility |  | 0
Other, net | 0 | 0
Net cash (used in) provided by financing activities | 0 | 0
Net increase in cash, cash equivalents, and restricted cash and cash equivalents | (270) | 841
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period | 2,777 | 2,826
Cash, cash equivalents, and restricted cash and cash equivalents at end of period | 2,507 | 3,667
1.125% Notes |  |
Financing activities: |  |
Repayment of principal amount of Notes | (236) | 0
1.125% Notes | Eliminations |  |
Financing activities: |  |
Repayment of principal amount of Notes | 0 |
1.125% Notes | Parent Guarantor | Reportable Legal Entities |  |
Financing activities: |  |
Repayment of principal amount of Notes | (236) |
1.125% Notes | Other Guarantors | Reportable Legal Entities |  |
Financing activities: |  |
Repayment of principal amount of Notes | 0 |
1.125% Notes | Non-Guarantors | Reportable Legal Entities |  |
Financing activities: |  |
Repayment of principal amount of Notes | 0 |
1.625% Notes |  |
Financing activities: |  |
Repayment of principal amount of Notes | (64) | $ 0
1.625% Notes | Eliminations |  |
Financing activities: |  |
Repayment of principal amount of Notes | 0 |
1.625% Notes | Parent Guarantor | Reportable Legal Entities |  |
Financing activities: |  |
Repayment of principal amount of Notes | (64) |
1.625% Notes | Other Guarantors | Reportable Legal Entities |  |
Financing activities: |  |
Repayment of principal amount of Notes | 0 |
1.625% Notes | Non-Guarantors | Reportable Legal Entities |  |
Financing activities: |  |
Repayment of principal amount of Notes | $ 0 |

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