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Equity (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 07, 2016
Dec. 04, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Accelerated share repurchases, number of shares acquired (in shares)   300,000 5,300,000 2,300,000 8,800,000 4,900,000    
Interest in joint venture minimum percentage (at least)         20.00%      
Agreement terms, change of control, put option for minority interest ownership, effective period         15 days      
2013 Repurchase Program                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized for repurchase               50,000,000
Maximum number of shares authorized for repurchase, as percentage of outstanding common stock               18.00%
Remaining shares available under repurchase program (in shares) 26,600,000   26,600,000   26,600,000      
Accelerated Share Repurchases, September 2016                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share repurchase program, authorized amount             $ 750,000,000  
Accelerated share repurchases, payment $ 750,000,000   $ 750,000,000   $ 750,000,000      
Initial Award | Accelerated Share Repurchases, September 2016                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Accelerated share repurchases, number of shares acquired (in shares) 4,400,000              
Additional Award | Accelerated Share Repurchases, September 2016                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Accelerated share repurchases, number of shares acquired (in shares) 900,000