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Supplemental Condensed Consolidating Financial Information - Cash Flows (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Operating activities: |  |
Net cash (used in) provided by operating activities | $ 672 | $ 278
Investing activities: |  |
Purchases of investments | (1,636) | (974)
Proceeds from sales and maturities of investments | 874 | 812
Purchases of property, equipment and capitalized software | (60) | (102)
(Increase) decrease in restricted investments held-to-maturity | (10) | 5
Net cash paid in business combinations | 0 | (8)
Capital contributions to/from subsidiaries | 0 | 0
Dividends to/from subsidiaries | 0 | 0
Change in amounts due to/from affiliates | 0 | 0
Other, net | (13) | (6)
Net cash used in investing activities | (845) | (273)
Financing activities: |  |
Proceeds from senior notes offering, net of issuance costs | 325 | 0
Proceeds from employee stock plans | 11 | 10
Other, net | (3) | 1
Net cash provided by financing activities | 333 | 11
Net increase in cash and cash equivalents | 160 | 16
Cash and cash equivalents at beginning of period | 2,819 | 2,329
Cash and cash equivalents at end of period | 2,979 | 2,345
Eliminations |  |
Operating activities: |  |
Net cash (used in) 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
(Increase) decrease in restricted investments held-to-maturity | 0 | 0
Net cash paid in business combinations |  | 0
Capital contributions to/from subsidiaries | 0 | 0
Dividends to/from subsidiaries | 0 | 0
Change in amounts due to/from affiliates | 0 | 0
Other, net | 0 | 0
Net cash used in investing activities | 0 | 0
Financing activities: |  |
Proceeds from senior notes offering, net of issuance costs | 0 |
Proceeds from employee stock plans | 0 | 0
Other, net | 0 | 0
Net cash provided by financing activities | 0 | 0
Net increase in cash and cash equivalents | 0 | 0
Cash and cash equivalents at beginning of period | 0 | 0
Cash and cash equivalents at end of period | 0 | 0
Parent Guarantor | Reportable Legal Entities |  |
Operating activities: |  |
Net cash (used in) provided by operating activities | 90 | (21)
Investing activities: |  |
Purchases of investments | (330) | (67)
Proceeds from sales and maturities of investments | 127 | 67
Purchases of property, equipment and capitalized software | (45) | (73)
(Increase) decrease in restricted investments held-to-maturity | 0 | 0
Net cash paid in business combinations |  | 0
Capital contributions to/from subsidiaries | (238) | (106)
Dividends to/from subsidiaries | 120 | 50
Change in amounts due to/from affiliates | (34) | (13)
Other, net | 0 | 5
Net cash used in investing activities | (400) | (137)
Financing activities: |  |
Proceeds from senior notes offering, net of issuance costs | 325 |
Proceeds from employee stock plans | 11 | 10
Other, net | (3) | 2
Net cash provided by financing activities | 333 | 12
Net increase in cash and cash equivalents | 23 | (146)
Cash and cash equivalents at beginning of period | 86 | 360
Cash and cash equivalents at end of period | 109 | 214
Other Guarantors | Reportable Legal Entities |  |
Operating activities: |  |
Net cash (used in) provided by operating activities | 44 | 20
Investing activities: |  |
Purchases of investments | 0 | 0
Proceeds from sales and maturities of investments | 0 | 0
Purchases of property, equipment and capitalized software | (9) | (19)
(Increase) decrease in restricted investments held-to-maturity | 0 | 0
Net cash paid in business combinations |  | (1)
Capital contributions to/from subsidiaries | 2 | 2
Dividends to/from subsidiaries | 0 | 0
Change in amounts due to/from affiliates | 2 | 2
Other, net | (13) | (12)
Net cash used in investing activities | (18) | (28)
Financing activities: |  |
Proceeds from senior notes offering, net of issuance costs | 0 |
Proceeds from employee stock plans | 0 | 0
Other, net | 0 | 0
Net cash provided by financing activities | 0 | 0
Net increase in cash and cash equivalents | 26 | (8)
Cash and cash equivalents at beginning of period | 6 | 13
Cash and cash equivalents at end of period | 32 | 5
Non-Guarantors | Reportable Legal Entities |  |
Operating activities: |  |
Net cash (used in) provided by operating activities | 538 | 279
Investing activities: |  |
Purchases of investments | (1,306) | (907)
Proceeds from sales and maturities of investments | 747 | 745
Purchases of property, equipment and capitalized software | (6) | (10)
(Increase) decrease in restricted investments held-to-maturity | (10) | 5
Net cash paid in business combinations |  | (7)
Capital contributions to/from subsidiaries | 236 | 104
Dividends to/from subsidiaries | (120) | (50)
Change in amounts due to/from affiliates | 32 | 11
Other, net | 0 | 1
Net cash used in investing activities | (427) | (108)
Financing activities: |  |
Proceeds from senior notes offering, net of issuance costs | 0 |
Proceeds from employee stock plans | 0 | 0
Other, net | 0 | (1)
Net cash provided by financing activities | 0 | (1)
Net increase in cash and cash equivalents | 111 | 170
Cash and cash equivalents at beginning of period | 2,727 | 1,956
Cash and cash equivalents at end of period | $ 2,838 | $ 2,126

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