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Employee Benefit Plans, Share Based Compensation, Equity Instruments Other Than Options (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Feb. 20, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Vested and Expected-to-Vest Options, Weighted Average Remaining Contractual Term at Period End 1 year 6 months 20 days        
Fair value of RSUs, RSAs and PSAs $ 185.7 $ 202.7 $ 238.5    
Intended quarterly dividend (in USD per share)         $ 0.1
Restricted Stock Units (RSU) and Restricted Stock [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period 3 years        
Restricted Stock Units (RSU) and Restricted Stock [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period 4 years        
Restricted Stock Units (RSUs) [Member]          
Restricted Stock Units And Performance Share Awards Activities          
Awards Granted, Number of Shares 8,100,000 8,900,000 10,000,000    
Awards Assumed, Number of Shares 300,000   400,000    
Awards Vested, Number of Shares (6,700,000) (7,200,000) (7,300,000)    
Awards Canceled, Number of Shares (1,600,000) (2,300,000) (4,000,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Awards Granted, Weighted Average Grant-Date Fair Value (in USD per share) $ 24.75 $ 23.41 $ 22.52    
Awards Assumed, Weighted Average Grant-Date Fair Value (in USD per share) 24.50   22.66    
Awards Vested, Weighted Average Grant-Date Fair Value (in USD per share) 22.55 22.58 22.98    
Awards Canceled, Weighted Average Grant-Date Fair Value (in USD per share) $ 23.20 $ 22.18 $ 21.63    
Performance Shares (PSAs) [Member]          
Restricted Stock Units And Performance Share Awards Activities          
Awards Granted, Number of Shares 1,200,000 1,000,000 1,400,000    
Awards Assumed, Number of Shares 2,600,000   200,000    
Awards Vested, Number of Shares (700,000) (300,000) (1,100,000)    
Awards Canceled, Number of Shares (700,000) (1,000,000) (3,200,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Awards Granted, Weighted Average Grant-Date Fair Value (in USD per share) $ 25.39 $ 23.76 $ 24.25    
Awards Assumed, Weighted Average Grant-Date Fair Value (in USD per share) 23.83   22.66    
Awards Vested, Weighted Average Grant-Date Fair Value (in USD per share) 21.83 22.52 36.19    
Awards Canceled, Weighted Average Grant-Date Fair Value (in USD per share) $ 22.71 $ 22.27 $ 30.43    
Aggregate Number Of Shares Subject to PSAs Granted 900,000 700,000 700,000    
Minimum shares to be Issued on achievement of performance goals in respect of PSAs 0 0 0    
Maximum shares to be issued on achievement of performance goals in respect of PSAs 1,200,000 1,000,000 1,400,000    
Performance Shares (PSAs) [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period 2 years        
Performance Shares (PSAs) [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period 3 years        
RSA [Member]          
Restricted Stock Units And Performance Share Awards Activities          
Awards Assumed, Number of Shares 700,000   900,000    
Awards Vested, Number of Shares (900,000) (1,800,000) (1,400,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Awards Assumed, Weighted Average Grant-Date Fair Value (in USD per share) $ 25.51   $ 22.66    
Awards Vested, Weighted Average Grant-Date Fair Value (in USD per share) $ 20.64 $ 20.13 $ 19.59    
RSUs, RSAs, and PSAs [Member]          
Restricted Stock Units And Performance Share Awards Activities          
Beginning Balance, Number of Shares 18,600,000 21,300,000 25,400,000    
Ending Balance, Number of Shares 20,900,000 18,600,000 21,300,000 25,400,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Beginning Balance, Weighted Average Grant-Date Fair Value (in USD per share) $ 22.71 $ 22.05 $ 23.44    
Ending Balance, Weighted Average Grant-Date Fair Value (in USD per share) $ 24.05 $ 22.71 $ 22.05 $ 23.44  
Weighted Average Remaining Contractual Term (In Years) 1 year 1 month 12 days 1 year 1 month 8 days 1 year 1 month 6 days 1 year 1 month 6 days  
RSUs and PSAs, Aggregate Intrinsic Value at Period End $ 590.6 $ 514.1 $ 475.0 $ 573.5  
Vested and Expected-to-Vest RSUs and PSAs, Number of Shares at Period End 17,900,000        
Vested and Expected-to-Vest RSUs and PSAs, Grant Date Fair Value (in USD per share) $ 24.06        
Vested and Expected-to-Vest Options, Weighted Average Remaining Contractual Term at Period End 1 year 14 days        
Vested and Expected-to-Vest RSUs and PSAs, Aggregate Intrinsic Value $ 505.3