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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