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Equity Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 31 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Jan. 01, 2018
Statement of Equity Table [Line Items]            
Beginning Balance     131,636,870      
Repurchase of common stock (4,700,000)   (12,500,000)   (29,000,000)  
Ending Balance 119,932,166   119,932,166   119,932,166  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning Balance $ 2,442 $ 2,423 $ 2,622 $ 2,469    
Cumulative effect of adoption of new accounting pronouncements           $ (22)
Net income 104 96 161 178    
Other comprehensive income 0 1 (1) 3    
Repurchase of common stock (102) (59) (302) (180) $ (776)  
Exercise of stock options 0 4 0 7    
Stock-based compensation 10 13 31 38    
Shares withheld for taxes on equity awards 0 (1) (10) (10)    
Dividends declared, APIC (11) (12) (34) (37)    
Dividends declared (11) (12) (36) (40)    
Ending Balance $ 2,443 $ 2,465 $ 2,443 $ 2,465 $ 2,443  
Common Stock [Member]            
Statement of Equity Table [Line Items]            
Beginning Balance 124,600,000 0 131,600,000 0    
Repurchase of common stock (4,700,000) 0 (12,500,000) 0    
Exercise of stock options, Shares 0 0 0 0    
Exercise of stock options, Value $ 0 $ 0 $ 0 $ 0    
Issuance of shares for vesting of equity awards 0 0 1,200,000 0    
Shares withheld for taxes on equity awards 0 0 (400,000) 0    
Ending Balance 119,900,000 0 119,900,000 0 119,900,000  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning Balance $ 1 $ 1 $ 1 $ 1    
Repurchase of common stock 0 0 0 0    
Issuance of shares for vesting of equity awards 0 0 0 0    
Shares withheld for taxes on equity awards 0 0 0 0    
Ending Balance 1 1 1 1 $ 1  
Additional Paid-in Capital [Member]            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning Balance 5,073 5,438 5,285 5,565    
Repurchase of common stock (102) (59) (302) (180)    
Exercise of stock options 0 4 0 7    
Stock-based compensation 10 13 31 38    
Shares withheld for taxes on equity awards 0 (1) (10) (10)    
Ending Balance 4,970 5,383 4,970 5,383 4,970  
Retained Earnings            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning Balance (2,588) (2,981) (2,631) (3,062)    
Cumulative effect of adoption of new accounting pronouncements           (13)
Net income 103 95 159 176    
Ending Balance (2,485) (2,886) (2,485) (2,886) (2,485)  
AOCI Attributable to Parent            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning Balance (47) (38) (37) (40)    
Cumulative effect of adoption of new accounting pronouncements           $ (9)
Other comprehensive income 0 1 (1) 3    
Ending Balance (47) (37) (47) (37) (47)  
Noncontrolling Interest [Member]            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning Balance 3 3 4 5    
Net income 1 1 2 2    
Dividends declared, Noncontrolling Interest 0 0 (2) (3)    
Ending Balance $ 4 $ 4 $ 4 $ 4 $ 4