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Supplemental Condensed Consolidating Financial Information - Condensed Consolidating Statements of Cash Flow (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:        
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 restricted investments   4 (6) (34)
Net cash paid in business combinations   (48) (450) (44)
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   (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
Contingent consideration liabilities settled   0 0 (50)
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
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
Change in restricted investments   0 0 0
Net cash paid in business combinations   0 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
Contingent consideration liabilities settled       0
Proceeds from common stock offering, net of issuance costs     0  
Proceeds from employee stock plans   0 0 0
Principal payments on convertible senior notes       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
Parent Guarantor        
Operating activities:        
Net cash provided by operating activities   55 113 74
Investing activities:        
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)
Capital contributions to subsidiaries   (386) (770) (292)
Dividends received from subsidiaries   101 142 0
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
Parent Guarantor | Reportable Legal Entities        
Operating activities:        
Net cash provided by operating activities   55 113 74
Investing activities:        
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 restricted investments   0 0 0
Net cash paid in business combinations   0 0 0
Capital contributions to subsidiaries   (386) (770) (292)
Dividends received from subsidiaries   101 142 0
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     689 123
Contingent consideration liabilities settled       0
Proceeds from common stock offering, net of issuance costs     373  
Proceeds from employee stock plans   18 18 14
Principal payments on convertible senior notes       (10)
Other, net   2 5 2
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
Other Guarantors | Reportable Legal Entities        
Operating activities:        
Net cash provided by operating activities   45 58 29
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   (34) (23) (12)
Change in restricted investments   0 5 5
Net cash paid in business combinations   (11) (214) 0
Capital contributions to subsidiaries   20 238 14
Dividends received from subsidiaries   0 (17) 0
Change in amounts due to/from affiliates   3 15 (1)
Other, net   (26) (35) (29)
Net cash used in investing activities   (48) (31) (23)
Financing activities:        
Proceeds from senior notes offerings, net of issuance costs     0 0
Contingent consideration liabilities settled       0
Proceeds from common stock offering, net of issuance costs     0  
Proceeds from employee stock plans   0 0 0
Principal payments on convertible senior notes       0
Other, net   (1) 0 0
Net cash provided by financing activities   (1) 0 0
Net increase in cash and cash equivalents   (4) 27 6
Cash and cash equivalents at beginning of period   42 15 9
Cash and cash equivalents at end of period   38 42 15
Non-Guarantors | Reportable Legal Entities        
Operating activities:        
Net cash provided by operating activities   573 954 957
Investing activities:        
Purchases of investments   (1,814) (1,679) (824)
Proceeds from sales and maturities of investments   1,778 1,008 370
Purchases of property, equipment and capitalized software   (17) (18) (9)
Change in restricted investments   4 (11) (39)
Net cash paid in business combinations   (37) (236) (44)
Capital contributions to subsidiaries   366 532 278
Dividends received from subsidiaries   (101) (125) 0
Change in amounts due to/from affiliates   15 53 (15)
Other, net   1 0 (2)
Net cash used in investing activities   195 (476) (285)
Financing activities:        
Proceeds from senior notes offerings, net of issuance costs     0 0
Contingent consideration liabilities settled       (50)
Proceeds from common stock offering, net of issuance costs     0  
Proceeds from employee stock plans   0 0 0
Principal payments on convertible senior notes       0
Other, net   0 0 0
Net cash provided by financing activities   0 0 (50)
Net increase in cash and cash equivalents   768 478 622
Cash and cash equivalents at beginning of period   1,927 1,449 827
Cash and cash equivalents at end of period   $ 2,695 $ 1,927 $ 1,449