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Supplemental Condensed Consolidating Financial Information - Cash Flows (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Operating activities: |  |
Net cash provided by operating activities | $ 719 | $ 139
Investing activities: |  |
Purchases of investments | (733) | (611)
Proceeds from sales and maturities of investments | 433 | 348
Purchases of property, equipment and capitalized software | (26) | (46)
Increase in restricted investments | (7) | (4)
Net cash paid in business combinations | 0 | (2)
Capital contributions to/from subsidiaries | 0 | 0
Dividends to/from subsidiaries | 0 |
Change in amounts due to/from affiliates | 0 | 0
Other, net | (6) | 1
Net cash used in investing activities | (339) | (314)
Financing activities: |  |
Proceeds from employee stock plans | 1 | 0
Other, net | (2) | 2
Net cash (used in) provided by financing activities | (1) | 2
Net increase (decrease) in cash and cash equivalents | 379 | (173)
Cash and cash equivalents at beginning of period | 2,819 | 2,329
Cash and cash equivalents at end of period | 3,198 | 2,156
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
Increase in restricted investments | 0 | 0
Net cash paid in business combinations |  | 0
Capital contributions to/from subsidiaries | 0 | 0
Dividends to/from subsidiaries | 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 employee stock plans | 0 |
Other, net | 0 | 0
Net cash (used in) provided by financing activities | 0 | 0
Net increase (decrease) 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 provided by operating activities | 144 | (38)
Investing activities: |  |
Purchases of investments | 0 | (35)
Proceeds from sales and maturities of investments | 92 | 10
Purchases of property, equipment and capitalized software | (18) | (28)
Increase in restricted investments | 0 | 0
Net cash paid in business combinations |  | 0
Capital contributions to/from subsidiaries | (106) | (36)
Dividends to/from subsidiaries | 50 |
Change in amounts due to/from affiliates | (60) | 23
Other, net | 0 | 6
Net cash used in investing activities | (42) | (60)
Financing activities: |  |
Proceeds from employee stock plans | 1 |
Other, net | (2) | 2
Net cash (used in) provided by financing activities | (1) | 2
Net increase (decrease) in cash and cash equivalents | 101 | (96)
Cash and cash equivalents at beginning of period | 86 | 360
Cash and cash equivalents at end of period | 187 | 264
Other Guarantors | Reportable Legal Entities |  |
Operating activities: |  |
Net cash provided by operating activities | 21 | 23
Investing activities: |  |
Purchases of investments | 0 | 0
Proceeds from sales and maturities of investments | 0 | 0
Purchases of property, equipment and capitalized software | (5) | (14)
Increase in restricted investments | 0 | 0
Net cash paid in business combinations |  | (1)
Capital contributions to/from subsidiaries | 1 | 2
Dividends to/from subsidiaries | 0 |
Change in amounts due to/from affiliates | 2 | (5)
Other, net | (6) | (5)
Net cash used in investing activities | (8) | (23)
Financing activities: |  |
Proceeds from employee stock plans | 0 |
Other, net | 0 | 0
Net cash (used in) provided by financing activities | 0 | 0
Net increase (decrease) in cash and cash equivalents | 13 | 0
Cash and cash equivalents at beginning of period | 6 | 13
Cash and cash equivalents at end of period | 19 | 13
Non-Guarantors | Reportable Legal Entities |  |
Operating activities: |  |
Net cash provided by operating activities | 554 | 154
Investing activities: |  |
Purchases of investments | (733) | (576)
Proceeds from sales and maturities of investments | 341 | 338
Purchases of property, equipment and capitalized software | (3) | (4)
Increase in restricted investments | (7) | (4)
Net cash paid in business combinations |  | (1)
Capital contributions to/from subsidiaries | 105 | 34
Dividends to/from subsidiaries | (50) |
Change in amounts due to/from affiliates | 58 | (18)
Other, net | 0 | 0
Net cash used in investing activities | (289) | (231)
Financing activities: |  |
Proceeds from employee stock plans | 0 |
Other, net | 0 | 0
Net cash (used in) provided by financing activities | 0 | 0
Net increase (decrease) in cash and cash equivalents | 265 | (77)
Cash and cash equivalents at beginning of period | 2,727 | 1,956
Cash and cash equivalents at end of period | $ 2,992 | $ 1,879

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