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Supplemental Condensed Consolidating Financial Information - Condensed Consolidating Statements of Cash Flow (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating activities: |  |  |  |
Net cash provided by operating activities |  | $ 804 | $ 673 | $ 1,125
Investing activities: |  |  |  |
Purchases of investments |  | (2,718) | (1,929) | (1,923)
Proceeds from sales and maturities of investments |  | 1,771 | 1,966 | 1,126
Purchases of property, equipment and capitalized software |  | (86) | (176) | (132)
(Increase) decrease in restricted investments held-to-maturity | $ 157 | (12) | 4 | (6)
Net cash paid in business combinations |  | 0 | (48) | (450)
Capital contributions to subsidiaries |  | 0 | 0 | 0
Dividends received from subsidiaries |  | 0 | 0 | 0
Change in amounts due to/from affiliates |  | 0 | 0 | 0
Other, net |  | (28) | (19) | (35)
Net cash used in investing activities |  | (1,073) | (202) | (1,420)
Financing activities: |  |  |  |
Proceeds from senior notes offerings, net of issuance costs |  | 325 | 0 | 689
Proceeds from borrowings under credit facility |  | 300 | 0 | 0
Proceeds from common stock offering, net of issuance costs |  | 0 | 0 | 373
Proceeds from employee stock plans |  | 19 | 18 | 18
Cash paid for financing transaction fees |  | (7) | 0 | 0
Other, net |  | (1) | 1 | 5
Net cash provided by financing activities |  | 636 | 19 | 1,085
Net increase in cash and cash equivalents |  | 367 | 490 | 790
Cash and cash equivalents at beginning of period |  | 2,819 | 2,329 | 1,539
Cash and cash equivalents at end of period | 3,186 | 3,186 | 2,819 | 2,329
Eliminations |  |  |  |
Operating activities: |  |  |  |
Net cash provided by operating activities |  | 0 | 0 | 0
Investing activities: |  |  |  |
Purchases of investments |  | 0 | 0 | 0
Proceeds from sales and maturities of investments |  | 0 | 0 | 0
Purchases of property, equipment and capitalized software |  | 0 | 0 | 0
(Increase) decrease in restricted investments held-to-maturity |  | 0 | 0 | 0
Net cash paid in business combinations |  |  | 0 | 0
Capital contributions to subsidiaries |  | 0 | 0 | 0
Dividends received from subsidiaries |  | 0 | 0 | 0
Change in amounts due to/from affiliates |  | 0 | 0 | 0
Other, net |  | 0 | 0 | 0
Net cash used in investing activities |  | 0 | 0 | 0
Financing activities: |  |  |  |
Proceeds from senior notes offerings, net of issuance costs |  | 0 |  | 0
Proceeds from borrowings under credit facility |  | 0 |  |
Proceeds from common stock offering, net of issuance costs |  |  |  | 0
Proceeds from employee stock plans |  | 0 | 0 | 0
Cash paid for financing transaction fees |  | 0 |  |
Other, net |  | 0 | 0 | 0
Net cash provided by financing activities |  | 0 | 0 | 0
Net increase in cash and cash equivalents |  | 0 | 0 | 0
Cash and cash equivalents at beginning of period |  | 0 | 0 | 0
Cash and cash equivalents at end of period | 0 | 0 | 0 | 0
Parent Guarantor |  |  |  |
Operating activities: |  |  |  |
Net cash provided by operating activities |  | 166 | 55 | 113
Investing activities: |  |  |  |
Purchases of investments |  | (352) | (115) | (244)
Proceeds from sales and maturities of investments |  | 168 | 188 | 118
Purchases of property, equipment and capitalized software |  | (67) | (125) | (91)
Capital contributions to subsidiaries |  | (370) | (386) | (770)
Dividends received from subsidiaries |  | 286 | 101 | 142
Change in amounts due to/from affiliates |  | (49) | (18) | (68)
Other, net |  | 0 | 6 | 0
Net cash used in investing activities |  | (384) | (349) | (913)
Financing activities: |  |  |  |
Proceeds from senior notes offerings, net of issuance costs |  | 325 | 0 | 689
Proceeds from borrowings under credit facility |  | 300 | 0 | 0
Proceeds from common stock offering, net of issuance costs |  | 0 | 0 | 373
Proceeds from employee stock plans |  | 19 | 18 | 18
Cash paid for financing transaction fees |  | (7) | 0 | 0
Other, net |  | (1) | 2 | 5
Net cash provided by financing activities |  | 636 | 20 | 1,085
Net increase in cash and cash equivalents |  | 418 | (274) | 285
Cash and cash equivalents at beginning of period |  | 86 | 360 | 75
Cash and cash equivalents at end of period | 504 | 504 | 86 | 360
Parent Guarantor | Reportable Legal Entities |  |  |  |
Operating activities: |  |  |  |
Net cash provided by operating activities |  | 166 | 55 | 113
Investing activities: |  |  |  |
Purchases of investments |  | (352) | (115) | (244)
Proceeds from sales and maturities of investments |  | 168 | 188 | 118
Purchases of property, equipment and capitalized software |  | (67) | (125) | (91)
(Increase) decrease in restricted investments held-to-maturity |  | 0 | 0 | 0
Net cash paid in business combinations |  |  | 0 | 0
Capital contributions to subsidiaries |  | (370) | (386) | (770)
Dividends received from subsidiaries |  | 286 | 101 | 142
Change in amounts due to/from affiliates |  | (49) | (18) | (68)
Other, net |  | 0 | 6 | 0
Net cash used in investing activities |  | (384) | (349) | (913)
Financing activities: |  |  |  |
Proceeds from senior notes offerings, net of issuance costs |  | 325 |  | 689
Proceeds from borrowings under credit facility |  | 300 |  |
Proceeds from common stock offering, net of issuance costs |  |  |  | 373
Proceeds from employee stock plans |  | 19 | 18 | 18
Cash paid for financing transaction fees |  | (7) |  |
Other, net |  | (1) | 2 | 5
Net cash provided by financing activities |  | 636 | 20 | 1,085
Net increase in cash and cash equivalents |  | 418 | (274) | 285
Cash and cash equivalents at beginning of period |  | 86 | 360 | 75
Cash and cash equivalents at end of period | 504 | 504 | 86 | 360
Other Guarantors | Reportable Legal Entities |  |  |  |
Operating activities: |  |  |  |
Net cash provided by operating activities |  | 83 | 48 | 51
Investing activities: |  |  |  |
Purchases of investments |  | 0 | 0 | 0
Proceeds from sales and maturities of investments |  | 0 | 0 | 0
Purchases of property, equipment and capitalized software |  | (11) | (29) | (20)
(Increase) decrease in restricted investments held-to-maturity |  | 0 | 0 | 5
Net cash paid in business combinations |  |  | (5) | (174)
Capital contributions to subsidiaries |  | 2 | 7 | 236
Dividends received from subsidiaries |  | (25) | 0 | 0
Change in amounts due to/from affiliates |  | 1 | (2) | (63)
Other, net |  | (28) | (26) | (35)
Net cash used in investing activities |  | (61) | (55) | (51)
Financing activities: |  |  |  |
Proceeds from senior notes offerings, net of issuance costs |  | 0 |  | 0
Proceeds from borrowings under credit facility |  | 0 |  |
Proceeds from common stock offering, net of issuance costs |  |  |  | 0
Proceeds from employee stock plans |  | 0 | 0 | 0
Cash paid for financing transaction fees |  | 0 |  |
Other, net |  | 0 | 0 | 0
Net cash provided by financing activities |  | 0 | 0 | 0
Net increase in cash and cash equivalents |  | 22 | (7) | 0
Cash and cash equivalents at beginning of period |  | 6 | 13 | 13
Cash and cash equivalents at end of period | 28 | 28 | 6 | 13
Non-Guarantors | Reportable Legal Entities |  |  |  |
Operating activities: |  |  |  |
Net cash provided by operating activities |  | 555 | 570 | 961
Investing activities: |  |  |  |
Purchases of investments |  | (2,366) | (1,814) | (1,679)
Proceeds from sales and maturities of investments |  | 1,603 | 1,778 | 1,008
Purchases of property, equipment and capitalized software |  | (8) | (22) | (21)
(Increase) decrease in restricted investments held-to-maturity |  | (12) | 4 | (11)
Net cash paid in business combinations |  |  | (43) | (276)
Capital contributions to subsidiaries |  | 368 | 379 | 534
Dividends received from subsidiaries |  | (261) | (101) | (142)
Change in amounts due to/from affiliates |  | 48 | 20 | 131
Other, net |  | 0 | 1 | 0
Net cash used in investing activities |  | (628) | 202 | (456)
Financing activities: |  |  |  |
Proceeds from senior notes offerings, net of issuance costs |  | 0 |  | 0
Proceeds from borrowings under credit facility |  | 0 |  |
Proceeds from common stock offering, net of issuance costs |  |  |  | 0
Proceeds from employee stock plans |  | 0 | 0 | 0
Cash paid for financing transaction fees |  | 0 |  |
Other, net |  | 0 | (1) | 0
Net cash provided by financing activities |  | 0 | (1) | 0
Net increase in cash and cash equivalents |  | (73) | 771 | 505
Cash and cash equivalents at beginning of period |  | 2,727 | 1,956 | 1,451
Cash and cash equivalents at end of period | $ 2,654 | $ 2,654 | $ 2,727 | $ 1,956

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