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Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities:      
Net cash provided by operating activities $ 804 $ 673 $ 1,125
Investing activities:      
Capital contributions to subsidiaries 0 0 0
Dividends received from subsidiaries 0 0 0
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)
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 2,819 2,329
Parent Company      
Operating activities:      
Net cash provided by operating activities 166 55 113
Investing activities:      
Capital contributions to subsidiaries (370) (386) (770)
Dividends received from subsidiaries 286 101 142
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)
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 $ 86 $ 360