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Supplemental Condensed Consolidating Financial Information - Cash Flows (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Operating activities:    
Net cash (used in) provided by operating activities $ 672 $ 278
Investing activities:    
Purchases of investments (1,636) (974)
Proceeds from sales and maturities of investments 874 812
Purchases of property, equipment and capitalized software (60) (102)
(Increase) decrease in restricted investments held-to-maturity (10) 5
Net cash paid in business combinations 0 (8)
Capital contributions to/from subsidiaries 0 0
Dividends to/from subsidiaries 0 0
Change in amounts due to/from affiliates 0 0
Other, net (13) (6)
Net cash used in investing activities (845) (273)
Financing activities:    
Proceeds from senior notes offering, net of issuance costs 325 0
Proceeds from employee stock plans 11 10
Other, net (3) 1
Net cash provided by financing activities 333 11
Net increase in cash and cash equivalents 160 16
Cash and cash equivalents at beginning of period 2,819 2,329
Cash and cash equivalents at end of period 2,979 2,345
Eliminations    
Operating activities:    
Net cash (used in) provided by operating activities 0 0
Investing activities:    
Purchases of investments 0 0
Proceeds from sales and maturities of investments 0 0
Purchases of property, equipment and capitalized software 0 0
(Increase) decrease in restricted investments held-to-maturity 0 0
Net cash paid in business combinations   0
Capital contributions to/from subsidiaries 0 0
Dividends to/from subsidiaries 0 0
Change in amounts due to/from affiliates 0 0
Other, net 0 0
Net cash used in investing activities 0 0
Financing activities:    
Proceeds from senior notes offering, net of issuance costs 0  
Proceeds from employee stock plans 0 0
Other, net 0 0
Net cash provided by financing activities 0 0
Net increase in cash and cash equivalents 0 0
Cash and cash equivalents at beginning of period 0 0
Cash and cash equivalents at end of period 0 0
Parent Guarantor | Reportable Legal Entities    
Operating activities:    
Net cash (used in) provided by operating activities 90 (21)
Investing activities:    
Purchases of investments (330) (67)
Proceeds from sales and maturities of investments 127 67
Purchases of property, equipment and capitalized software (45) (73)
(Increase) decrease in restricted investments held-to-maturity 0 0
Net cash paid in business combinations   0
Capital contributions to/from subsidiaries (238) (106)
Dividends to/from subsidiaries 120 50
Change in amounts due to/from affiliates (34) (13)
Other, net 0 5
Net cash used in investing activities (400) (137)
Financing activities:    
Proceeds from senior notes offering, net of issuance costs 325  
Proceeds from employee stock plans 11 10
Other, net (3) 2
Net cash provided by financing activities 333 12
Net increase in cash and cash equivalents 23 (146)
Cash and cash equivalents at beginning of period 86 360
Cash and cash equivalents at end of period 109 214
Other Guarantors | Reportable Legal Entities    
Operating activities:    
Net cash (used in) provided by operating activities 44 20
Investing activities:    
Purchases of investments 0 0
Proceeds from sales and maturities of investments 0 0
Purchases of property, equipment and capitalized software (9) (19)
(Increase) decrease in restricted investments held-to-maturity 0 0
Net cash paid in business combinations   (1)
Capital contributions to/from subsidiaries 2 2
Dividends to/from subsidiaries 0 0
Change in amounts due to/from affiliates 2 2
Other, net (13) (12)
Net cash used in investing activities (18) (28)
Financing activities:    
Proceeds from senior notes offering, net of issuance costs 0  
Proceeds from employee stock plans 0 0
Other, net 0 0
Net cash provided by financing activities 0 0
Net increase in cash and cash equivalents 26 (8)
Cash and cash equivalents at beginning of period 6 13
Cash and cash equivalents at end of period 32 5
Non-Guarantors | Reportable Legal Entities    
Operating activities:    
Net cash (used in) provided by operating activities 538 279
Investing activities:    
Purchases of investments (1,306) (907)
Proceeds from sales and maturities of investments 747 745
Purchases of property, equipment and capitalized software (6) (10)
(Increase) decrease in restricted investments held-to-maturity (10) 5
Net cash paid in business combinations   (7)
Capital contributions to/from subsidiaries 236 104
Dividends to/from subsidiaries (120) (50)
Change in amounts due to/from affiliates 32 11
Other, net 0 1
Net cash used in investing activities (427) (108)
Financing activities:    
Proceeds from senior notes offering, net of issuance costs 0  
Proceeds from employee stock plans 0 0
Other, net 0 (1)
Net cash provided by financing activities 0 (1)
Net increase in cash and cash equivalents 111 170
Cash and cash equivalents at beginning of period 2,727 1,956
Cash and cash equivalents at end of period $ 2,838 $ 2,126