v3.3.1.900
Stock-Based Compensation (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value $ 6,000,000 $ 21,000,000 $ 22,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Options Outstanding, Beginning balance, Number 11,086,320    
Options Outstanding, Beginning balance, Weighted Average Exercise Price $ 18.82    
Options Outstanding, Beginning balance, Weighted Average Remaining Term (in years) 3 years 10 months 24 days 2 years  
Options Outstanding, Beginning balance, Aggregate Intrinsic Value (in $ millions) $ 43,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 1,153,680    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 13.70    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period 6,877,468    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price $ 21.98    
Options Outstanding, Ending balance, Number 3,055,172 11,086,320  
Options Outstanding, Ending balance, Weighted Average Exercise Price $ 13.62 $ 18.82  
Options Outstanding, Ending balance, Weighted Average Remaining Term (in years) 3 years 10 months 24 days 2 years  
Options Outstanding, Ending balance, Aggregate Intrinsic Value (in $ millions) $ 5,000,000 $ 43,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 3,055,172    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 13.62    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3 years 10 months 24 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 5,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 3,055,172    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 13.62    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term 3 years 10 months 24 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value $ 5,000,000    
Disclosure of Compensation Related Costs Share-based Payments (Textuals) [Abstract]      
Vesting period for graded and cliff vesting options - minimum 1 year    
Vesting period for graded and cliff vesting options - maximum 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Expiration Minimum Range 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Expiration Maximum Range 10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized for Directors 567,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized for Employees 40,533,000    
Vest Term of First Sub Grant 1 year    
Vest Term of the Second Sub-Grant 2 years    
Vest Term of the Third Sub-Grant 3 years    
Grants in Option Grants with Three Year Cliff Vesting 1 year    
Vesting term of option grants with three year cliff vesting 3 years    
Stock-based compensation expense $ 31,000,000 31,000,000 34,000,000
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options 8,000,000 $ 20,000,000 20,000,000
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   1.20%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   27.00%  
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   1.60%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   30.50%  
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value 39,000,000 $ 35,000,000 25,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 24,000,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 1 month 6 days    
Restricted Stock and Stock Unit Activity [Abstract]      
Nonvested Restricted Stock, Beginning balance, Number 4,201,868    
Nonvested Restricted Stock, Beginning balance, Weighted Average Grant Date Fair Value $ 18.01    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 1,614,378    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 21.25    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 325,608    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Grant Date Fair Value $ 19.66    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 1,962,368    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 16.99    
Nonvested Restricted Stock, Ending balance, Number 3,528,270 4,201,868  
Nonvested Restricted Stock, Ending balance, Weighted Average Grant Date Fair Value $ 19.91 $ 18.01  
Performance Shares [Member]      
Restricted Stock and Stock Unit Activity [Abstract]      
Nonvested Restricted Stock, Beginning balance, Number 867,479    
Nonvested Restricted Stock, Beginning balance, Weighted Average Grant Date Fair Value $ 21.93    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 365,667    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 23.91    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 113,993    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Grant Date Fair Value $ 22.38    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period [1] 601,247    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 21.82    
Nonvested Restricted Stock, Ending balance, Number 517,906 867,479  
Nonvested Restricted Stock, Ending balance, Weighted Average Grant Date Fair Value $ 23.36 $ 21.93  
Disclosure of Compensation Related Costs Share-based Payments (Textuals) [Abstract]      
Allocated Share Based Compensation Expense Liability Classified Share-Based Awards $ (5,000,000) $ 5,000,000 $ 2,000,000
Director Plan [Member]      
Disclosure of Compensation Related Costs Share-based Payments (Textuals) [Abstract]      
Common Stock, Capital Shares Reserved for Future Issuance 149,088    
Equity Plan [Member]      
Disclosure of Compensation Related Costs Share-based Payments (Textuals) [Abstract]      
Common Stock, Capital Shares Reserved for Future Issuance 12,499,779    
[1] Number ofPerformance Share Units WeightedAverageGrant-DateFair ValueNonvested — December 31, 2014867,479 $21.93Granted365,667 $23.91Forfeited113,993 $22.38Vested601,247 $21.82Nonvested — December 31, 2015517,906 $23.36