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Employee Incentive Plans (2007 Stock Incentive Plan, ROI Summary) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair Value - Date of Grant $ 55 $ 52 $ 49 $ 348
2007 Stock Incentive Plan (Shares)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Beginning Balance 8,937,985 10,376,800 11,647,117  
Shares Granted 1,445,479 1,211,533 1,709,968  
Shares Cancelled (69,340) (163,221) (535,085)  
Shares Distributed (2,402,062) (2,487,127) (2,445,200)  
Ending Balance 7,912,062 8,937,985 10,376,800  
Intrinsic Value Of SIP Shares Which Vested And Were Distributed [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair Value - Date of Grant [1] $ 88 $ 86 $ 56  
2007 ROI Unit Stock Plan (Shares) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Beginning Balance 6,370 9,614    
Shares Cancelled [2]     15,518  
Shares Distributed (1,376) (3,244) (5,904)  
Ending Balance 4,994 6,370 9,614  
[1] Intrinsic value of SIP shares distributed represents the compensation value reported to the participants.
[2] ROI Unit Stock Plan number of cancelled unearned shares related to prior years was adjusted by 15,518 shares during the period