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Supplemental Condensed Consolidating Financial Information - Cash Flows (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Operating activities: |  |
Net cash provided by operating activities | $ 314 | $ 672
Investing activities: |  |
Purchases of investments | (914) | (1,636)
Proceeds from sales and maturities of investments | 1,335 | 874
Purchases of property, equipment and capitalized software | (14) | (60)
Capital contributions to subsidiaries | 0 | 0
Dividends from subsidiaries | 0 | 0
Change in amounts due to/from affiliates | 0 | 0
Other, net | (9) | (24)
Net cash provided by (used in) investing activities | 398 | (846)
Financing activities: |  |
Repayment of credit facility | (300) | 0
Repayment of 1.125% Convertible Notes | (89) | 0
Cash paid for partial settlement of 1.125% Conversion Option | (134) | 0
Cash received for partial termination of 1.125% Call Option | 134 | 0
Cash paid for partial termination of 1.125% Warrants | (113) | 0
Proceeds from senior notes offerings, net of issuance costs |  | 325
Other, net | (1) | 8
Net cash (used in) provided by financing activities | (503) | 333
Net increase in cash, cash equivalents, and restricted cash and cash equivalents | 209 | 159
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 | 3,499 | 3,071
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 |
Repayment of 1.125% Convertible Notes | 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
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 | 49 | 90
Investing activities: |  |
Purchases of investments | (136) | (330)
Proceeds from sales and maturities of investments | 303 | 127
Purchases of property, equipment and capitalized software | (9) | (45)
Capital contributions to subsidiaries | (117) | (238)
Dividends from subsidiaries | 60 | 120
Change in amounts due to/from affiliates | 75 | (34)
Other, net | 0 | 0
Net cash provided by (used in) investing activities | 176 | (400)
Financing activities: |  |
Repayment of credit facility | (300) |
Repayment of 1.125% Convertible Notes | (89) |
Cash paid for partial settlement of 1.125% Conversion Option | (134) |
Cash received for partial termination of 1.125% Call Option | 134 |
Cash paid for partial termination of 1.125% Warrants | (113) |
Proceeds from senior notes offerings, net of issuance costs |  | 325
Other, net | (1) | 8
Net cash (used in) provided by financing activities | (503) | 333
Net increase in cash, cash equivalents, and restricted cash and cash equivalents | (278) | 23
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 | 235 | 109
Other Guarantors | Reportable Legal Entities |  |
Operating activities: |  |
Net cash provided by operating activities | 9 | 44
Investing activities: |  |
Purchases of investments | 0 | 0
Proceeds from sales and maturities of investments | 0 | 0
Purchases of property, equipment and capitalized software | (3) | (9)
Capital contributions to subsidiaries | 0 | 2
Dividends from subsidiaries | (10) | 0
Change in amounts due to/from affiliates | 1 | 2
Other, net | (14) | (13)
Net cash provided by (used in) investing activities | (26) | (18)
Financing activities: |  |
Repayment of credit facility | 0 |
Repayment of 1.125% Convertible Notes | 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
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 | (17) | 26
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period | 28 | 6
Cash, cash equivalents, and restricted cash and cash equivalents at end of period | 11 | 32
Non-Guarantors | Reportable Legal Entities |  |
Operating activities: |  |
Net cash provided by operating activities | 256 | 538
Investing activities: |  |
Purchases of investments | (778) | (1,306)
Proceeds from sales and maturities of investments | 1,032 | 747
Purchases of property, equipment and capitalized software | (2) | (6)
Capital contributions to subsidiaries | 117 | 236
Dividends from subsidiaries | (50) | (120)
Change in amounts due to/from affiliates | (76) | 32
Other, net | 5 | (11)
Net cash provided by (used in) investing activities | 248 | (428)
Financing activities: |  |
Repayment of credit facility | 0 |
Repayment of 1.125% Convertible Notes | 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
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 | 504 | 110
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period | 2,749 | 2,820
Cash, cash equivalents, and restricted cash and cash equivalents at end of period | $ 3,253 | $ 2,930

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