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Share-Based Compensation (Full Value Share Award Activity) (Details 4) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of equity instruments other than options vested in period (in dollars) $ 107 $ 128 $ 97
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Non-vested at beginning of the period (in shares) 1.1    
Granted (in shares) 0.8    
Deferred (in shares) 0.2    
Vested (in shares) (0.8)    
Forfeited (in shares) (0.1)    
Non-vested at end of the period (in shares) 1.2 1.1  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted average grant-date fair value, non-vested at the beginning of the period (in dollars per share) $ 130.17    
Weighted average grant-date fair value, granted during the period (in dollars per share) 130.84    
Weighted average grant-date fair value, deferred during the period (in dollars per share) 140.57    
Weighted average grant-date fair value, vested during the period (in dollars per share) 128.86    
Weighted average grant-date fair value, forfeited during the period (in dollars per share) 131.47    
Weighted average grant-date fair value, non-vested at the end of the period (in dollars per share) $ 133.40 $ 130.17  
Restricted stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 5 years    
RSA RSU and DSU awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted average grant-date fair value, non-vested at the beginning of the period (in dollars per share) $ 172.69 124.51  
Weighted average grant-date fair value, non-vested at the end of the period (in dollars per share) 129.30 172.69 $ 124.51
Advisor deferral plans [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted average grant-date fair value, non-vested at the beginning of the period (in dollars per share) 144.37 134.58  
Weighted average grant-date fair value, non-vested at the end of the period (in dollars per share) $ 136.81 $ 144.37 $ 134.58
Minimum [Member] | Restricted stock units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Minimum [Member] | Restricted stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Maximum [Member] | Restricted stock units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 4 years    
Maximum [Member] | Restricted stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 4 years    
P1 Plan [Member] | Share Based Bonus Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 3.0