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Supplemental Condensed Consolidating Financial Information - Cash Flows (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Operating activities:    
Net cash provided by operating activities $ 957 $ 633
Investing activities:    
Purchases of investments (1,896) (1,444)
Proceeds from sales and maturities of investments 1,538 1,512
Purchases of property, equipment and capitalized software (85) (143)
(Increase) decrease in restricted investments held-to-maturity (10) 4
Net cash paid in business combinations 0 (48)
Capital contributions to/from subsidiaries 0 0
Dividends to/from subsidiaries 0 0
Change in amounts due to/from affiliates 0 0
Other, net (21) (12)
Net cash used in investing activities (474) (131)
Financing activities:    
Proceeds from senior notes offering, net of issuance costs 325  
Proceeds from borrowings under credit facility 300 0
Proceeds from employee stock plans 11 10
Other, net (4) 1
Net cash provided by financing activities 632 11
Net increase in cash and cash equivalents 1,115 513
Cash and cash equivalents at beginning of period 2,819 2,329
Cash and cash equivalents at end of period 3,934 2,842
Eliminations    
Operating activities:    
Net cash 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 borrowings under credit facility 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 provided by operating activities 215 43
Investing activities:    
Purchases of investments (333) (114)
Proceeds from sales and maturities of investments 150 103
Purchases of property, equipment and capitalized software (67) (102)
(Increase) decrease in restricted investments held-to-maturity 0 0
Net cash paid in business combinations   0
Capital contributions to/from subsidiaries (363) (221)
Dividends to/from subsidiaries 136 50
Change in amounts due to/from affiliates (100) (12)
Other, net 0 6
Net cash used in investing activities (577) (290)
Financing activities:    
Proceeds from senior notes offering, net of issuance costs 325  
Proceeds from borrowings under credit facility 300  
Proceeds from employee stock plans 11 10
Other, net (4) 2
Net cash provided by financing activities 632 12
Net increase in cash and cash equivalents 270 (235)
Cash and cash equivalents at beginning of period 86 360
Cash and cash equivalents at end of period 356 125
Other Guarantors | Reportable Legal Entities    
Operating activities:    
Net cash provided by operating activities 81 34
Investing activities:    
Purchases of investments 0 0
Proceeds from sales and maturities of investments 0 0
Purchases of property, equipment and capitalized software (10) (23)
(Increase) decrease in restricted investments held-to-maturity 0 0
Net cash paid in business combinations   (5)
Capital contributions to/from subsidiaries 2 7
Dividends to/from subsidiaries 0 0
Change in amounts due to/from affiliates 0 4
Other, net (21) (19)
Net cash used in investing activities (29) (36)
Financing activities:    
Proceeds from senior notes offering, net of issuance costs 0  
Proceeds from borrowings under credit facility 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 52 (2)
Cash and cash equivalents at beginning of period 6 13
Cash and cash equivalents at end of period 58 11
Non-Guarantors | Reportable Legal Entities    
Operating activities:    
Net cash provided by operating activities 661 556
Investing activities:    
Purchases of investments (1,563) (1,330)
Proceeds from sales and maturities of investments 1,388 1,409
Purchases of property, equipment and capitalized software (8) (18)
(Increase) decrease in restricted investments held-to-maturity (10) 4
Net cash paid in business combinations   (43)
Capital contributions to/from subsidiaries 361 214
Dividends to/from subsidiaries (136) (50)
Change in amounts due to/from affiliates 100 8
Other, net 0 1
Net cash used in investing activities 132 195
Financing activities:    
Proceeds from senior notes offering, net of issuance costs 0  
Proceeds from borrowings under credit facility 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 793 750
Cash and cash equivalents at beginning of period 2,727 1,956
Cash and cash equivalents at end of period $ 3,520 $ 2,706