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Supplemental Condensed Consolidating Financial Information - Cash Flows (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Operating activities: |  |
Net cash provided by operating activities | $ 394 | $ 719
Investing activities: |  |
Purchases of investments | (389) | (733)
Proceeds from sales and maturities of investments | 543 | 433
Purchases of property, equipment and capitalized software | (4) | (26)
Decrease in restricted investments held-to-maturity | 0 | (5)
Capital contributions to subsidiaries | 0 | 0
Dividends from subsidiaries |  | 0
Change in amounts due to/from affiliates | 0 | 0
Other, net | (5) | (6)
Net cash provided by (used in) investing activities | 145 | (337)
Financing activities: |  |
Cash paid for financing transaction fees | (5) | 0
Proceeds from employee stock plans | 0 | 1
Other, net | 0 | (2)
Net cash used in financing activities | (5) | (1)
Net increase in cash, cash equivalents, and restricted cash and cash equivalents | 534 | 381
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 | 3,824 | 3,293
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
Decrease in restricted investments held-to-maturity |  | 0
Capital contributions to subsidiaries | 0 | 0
Dividends from subsidiaries |  | 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: |  |
Cash paid for financing transaction fees | 0 |
Proceeds from employee stock plans |  | 0
Other, net |  | 0
Net cash used in 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 | 6 | 144
Investing activities: |  |
Purchases of investments | (130) | 0
Proceeds from sales and maturities of investments | 5 | 92
Purchases of property, equipment and capitalized software | (1) | (18)
Decrease in restricted investments held-to-maturity |  | 0
Capital contributions to subsidiaries | (80) | (106)
Dividends from subsidiaries |  | 50
Change in amounts due to/from affiliates | (3) | (60)
Other, net | 2 | 0
Net cash provided by (used in) investing activities | (207) | (42)
Financing activities: |  |
Cash paid for financing transaction fees | (5) |
Proceeds from employee stock plans |  | 1
Other, net |  | (2)
Net cash used in financing activities | (5) | (1)
Net increase in cash, cash equivalents, and restricted cash and cash equivalents | (206) | 101
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 | 307 | 187
Other Guarantors | Reportable Legal Entities |  |
Operating activities: |  |
Net cash provided by operating activities | 9 | 21
Investing activities: |  |
Purchases of investments | 0 | 0
Proceeds from sales and maturities of investments | 0 | 0
Purchases of property, equipment and capitalized software | (2) | (5)
Decrease in restricted investments held-to-maturity |  | 0
Capital contributions to subsidiaries | 0 | 1
Dividends from subsidiaries |  | 0
Change in amounts due to/from affiliates | (2) | 2
Other, net | (6) | (6)
Net cash provided by (used in) investing activities | (10) | (8)
Financing activities: |  |
Cash paid for financing transaction fees | 0 |
Proceeds from employee stock plans |  | 0
Other, net |  | 0
Net cash used in financing activities | 0 | 0
Net increase in cash, cash equivalents, and restricted cash and cash equivalents | (1) | 13
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 | 27 | 19
Non-Guarantors | Reportable Legal Entities |  |
Operating activities: |  |
Net cash provided by operating activities | 379 | 554
Investing activities: |  |
Purchases of investments | (259) | (733)
Proceeds from sales and maturities of investments | 538 | 341
Purchases of property, equipment and capitalized software | (1) | (3)
Decrease in restricted investments held-to-maturity |  | (5)
Capital contributions to subsidiaries | 80 | 105
Dividends from subsidiaries |  | (50)
Change in amounts due to/from affiliates | 5 | 58
Other, net | (1) | 0
Net cash provided by (used in) investing activities | 362 | (287)
Financing activities: |  |
Cash paid for financing transaction fees | 0 |
Proceeds from employee stock plans |  | 0
Other, net |  | 0
Net cash used in financing activities | 0 | 0
Net increase in cash, cash equivalents, and restricted cash and cash equivalents | 741 | 267
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 | $ 3,490 | $ 3,087

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