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Supplemental Condensed Consolidating Financial Information - Cash Flows (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating activities:    
Net cash provided by operating activities $ 394 $ 719
Investing activities:    
Purchases of investments (389) (733)
Proceeds from sales and maturities of investments 543 433
Purchases of property, equipment and capitalized software (4) (26)
Decrease in restricted investments held-to-maturity 0 (5)
Capital contributions to subsidiaries 0 0
Dividends from subsidiaries   0
Change in amounts due to/from affiliates 0 0
Other, net (5) (6)
Net cash provided by (used in) investing activities 145 (337)
Financing activities:    
Cash paid for financing transaction fees (5) 0
Proceeds from employee stock plans 0 1
Other, net 0 (2)
Net cash used in financing activities (5) (1)
Net increase in cash, cash equivalents, and restricted cash and cash equivalents 534 381
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period 3,290 2,912
Cash, cash equivalents, and restricted cash and cash equivalents at end of period 3,824 3,293
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
Decrease in restricted investments held-to-maturity   0
Capital contributions to subsidiaries 0 0
Dividends from subsidiaries   0
Change in amounts due to/from affiliates 0 0
Other, net 0 0
Net cash provided by (used in) investing activities 0 0
Financing activities:    
Cash paid for financing transaction fees 0  
Proceeds from employee stock plans   0
Other, net   0
Net cash used in financing activities 0 0
Net increase in cash, cash equivalents, and restricted cash and cash equivalents 0 0
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period 0 0
Cash, cash equivalents, and restricted cash and cash equivalents at end of period 0 0
Parent Guarantor | Reportable Legal Entities    
Operating activities:    
Net cash provided by operating activities 6 144
Investing activities:    
Purchases of investments (130) 0
Proceeds from sales and maturities of investments 5 92
Purchases of property, equipment and capitalized software (1) (18)
Decrease in restricted investments held-to-maturity   0
Capital contributions to subsidiaries (80) (106)
Dividends from subsidiaries   50
Change in amounts due to/from affiliates (3) (60)
Other, net 2 0
Net cash provided by (used in) investing activities (207) (42)
Financing activities:    
Cash paid for financing transaction fees (5)  
Proceeds from employee stock plans   1
Other, net   (2)
Net cash used in financing activities (5) (1)
Net increase in cash, cash equivalents, and restricted cash and cash equivalents (206) 101
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period 513 86
Cash, cash equivalents, and restricted cash and cash equivalents at end of period 307 187
Other Guarantors | Reportable Legal Entities    
Operating activities:    
Net cash provided by operating activities 9 21
Investing activities:    
Purchases of investments 0 0
Proceeds from sales and maturities of investments 0 0
Purchases of property, equipment and capitalized software (2) (5)
Decrease in restricted investments held-to-maturity   0
Capital contributions to subsidiaries 0 1
Dividends from subsidiaries   0
Change in amounts due to/from affiliates (2) 2
Other, net (6) (6)
Net cash provided by (used in) investing activities (10) (8)
Financing activities:    
Cash paid for financing transaction fees 0  
Proceeds from employee stock plans   0
Other, net   0
Net cash used in financing activities 0 0
Net increase in cash, cash equivalents, and restricted cash and cash equivalents (1) 13
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period 28 6
Cash, cash equivalents, and restricted cash and cash equivalents at end of period 27 19
Non-Guarantors | Reportable Legal Entities    
Operating activities:    
Net cash provided by operating activities 379 554
Investing activities:    
Purchases of investments (259) (733)
Proceeds from sales and maturities of investments 538 341
Purchases of property, equipment and capitalized software (1) (3)
Decrease in restricted investments held-to-maturity   (5)
Capital contributions to subsidiaries 80 105
Dividends from subsidiaries   (50)
Change in amounts due to/from affiliates 5 58
Other, net (1) 0
Net cash provided by (used in) investing activities 362 (287)
Financing activities:    
Cash paid for financing transaction fees 0  
Proceeds from employee stock plans   0
Other, net   0
Net cash used in financing activities 0 0
Net increase in cash, cash equivalents, and restricted cash and cash equivalents 741 267
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period 2,749 2,820
Cash, cash equivalents, and restricted cash and cash equivalents at end of period $ 3,490 $ 3,087