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Share-Based Compensation (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
LTIP 2008 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percent Of Share Based Award Available For Grant In Succeeding Calendar Year 2.00%    
Percent Of Share Based Award Available For Grant Limit On Increase 3.00%    
Number of unused share-based awards carried forward 423,000,000    
Performance Shares [Member]      
Assumptions [Abstract]      
Grant date fair value $ 15.56 $ 16.98  
Share Price $ 13.54 $ 16.03  
Expected volatility 23.10% 23.30%  
Risk free interest rate 0.98% 1.09%  
Annualized dividend yield 4.43% 3.74%  
Period Used In Expected Volatility Calculations 3 years    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Arrangement by Share based Payment Award Vesting Rights Percentage Anniversary Year 1 33.00%    
Share Based Compensation Arrangement by Share based Payment Award Vesting Rights Percentage Anniversary Year 2 33.00%    
Share Based Compensation Arrangement by Share based Payment Award Vesting Rights Percentage Anniversary Year 3 33.00%    
Share Based Compensation Arrangement By Share Based Payment Award Requisite Performance Period 3 years    
Stock activity rollforward      
Outstanding, beginning of year (in shares) 27,400,000    
Granted (in shares) 17,500,000    
Vested (in shares) (11,100,000)    
Forfeited (in shares) (400,000)    
Outstanding, end of year (in shares) 33,400,000 27,400,000  
RSU-stock expected to vest (in shares) 32,900,000    
Outstanding, beginning of year (weighted-average grant date fair value) $ 15.04    
Granted (weighted-average grant-date fair value) 13.54    
Vested (weighted-average grant-date fair value) 14.07    
Forfeited (weighted-average grant-date fair value) 14.13    
Outstanding, end of year (weighted-average grant date fair value) $ 14.49 $ 15.04  
Compensation cost [Abstract]      
Fair value of vested shares $ 157,000,000 $ 126,000,000 $ 102,000,000
Weighted average grant fair value (per unit) 13.54 15.86 15.40
Compensation cost $ 135,000,000 $ 125,000,000 $ 95,000,000
Tax benefit from compensation expense 72,000,000 $ 65,000,000 $ 49,000,000
Unrealized compensation cost on non-vested stock $ 90,000,000    
Unrealized compensation weighted average period non-vested stock 1 year 10 months    
Restricted Stock Units (RSUs) [Member] | 2014 Plan RSU Awards [Member]      
Stock activity rollforward      
Vested, Unissued (in shares) 362,271    
Employee Stock Option [Member]      
Compensation cost [Abstract]      
Compensation cost $ 2,100,000    
Tax benefit from compensation expense 500,000    
Unrealized compensation cost on non-vested stock $ 400,000    
Stock Options [Abstract]      
Outstanding (in shares) 35,500,000 45,400,000  
Exercisable (in shares) 33,400,000 39,300,000  
Intrinsic value of vested options $ 75,000,000    
Intrinsic value of unvested options $ 0    
Average remaining term vested options 4 years 2 months    
Average remaining term unvested options 7 years 2 months    
Cash received from exercise of stock options $ 58,000,000    
New stock issuances to settle exercised options $ 119,000,000    
PeerGroup [Member] | Performance Shares [Member]      
Assumptions [Abstract]      
Expected volatility 26.40% 24.10%