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Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Operating activities: |  |  |  |
Net cash provided by operating activities |  | $ 673 | $ 1,125 | $ 1,060
Investing activities: |  |  |  |
Capital contributions to subsidiaries |  | 0 | 0 | 0
Dividends received from subsidiaries |  | 0 | 0 | 0
Purchases of investments |  | (1,929) | (1,923) | (953)
Proceeds from sales and maturities of investments |  | 1,966 | 1,126 | 633
Purchases of property, equipment and capitalized software |  | (176) | (132) | (115)
Change in amounts due to/from affiliates |  | 0 | 0 | 0
Other, net |  | (19) | (35) | (23)
Net cash used in investing activities |  | (202) | (1,420) | (536)
Financing activities: |  |  |  |
Proceeds from senior notes offerings, net of issuance costs |  | 0 | 689 | 123
Proceeds from common stock offering, net of issuance costs | $ 373 | 0 | 373 | 0
Proceeds from employee stock plans |  | 18 | 18 | 14
Principal payments on convertible senior notes |  | 0 | 0 | (10)
Other, net |  | 1 | 5 | 2
Net cash provided by financing activities |  | 19 | 1,085 | 79
Net increase in cash and cash equivalents |  | 490 | 790 | 603
Cash and cash equivalents at beginning of period |  | 2,329 | 1,539 | 936
Cash and cash equivalents at end of period |  | 2,819 | 2,329 | 1,539
Parent Company |  |  |  |
Operating activities: |  |  |  |
Net cash provided by operating activities |  | 55 | 113 | 74
Investing activities: |  |  |  |
Capital contributions to subsidiaries |  | (386) | (770) | (292)
Dividends received from subsidiaries |  | 101 | 142 | 0
Purchases of investments |  | (115) | (244) | (129)
Proceeds from sales and maturities of investments |  | 188 | 118 | 263
Purchases of property, equipment and capitalized software |  | (125) | (91) | (94)
Change in amounts due to/from affiliates |  | (18) | (68) | 16
Other, net |  | 6 | 0 | 8
Net cash used in investing activities |  | (349) | (913) | (228)
Financing activities: |  |  |  |
Proceeds from senior notes offerings, net of issuance costs |  | 0 | 689 | 123
Proceeds from common stock offering, net of issuance costs |  | 0 | 373 | 0
Proceeds from employee stock plans |  | 18 | 18 | 14
Principal payments on convertible senior notes |  | 0 | 0 | (11)
Other, net |  | 2 | 5 | 3
Net cash provided by financing activities |  | 20 | 1,085 | 129
Net increase in cash and cash equivalents |  | (274) | 285 | (25)
Cash and cash equivalents at beginning of period |  | 360 | 75 | 100
Cash and cash equivalents at end of period |  | $ 86 | $ 360 | $ 75

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