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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