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Stock-based Compensation Plans Stock-based Compensation Plans (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
installment
shares
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation cost | $ $ 2,170 $ 2,300 $ 2,280
Tax benefit from compensation expense | $ $ 824 $ 854 $ 842
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of vesting installments | installment 3    
Period vesting of restricted stock units begins 1 year    
Stock-settled Restricted Stock and Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units granted in period (in shares) 2,079,667    
Key Associate Stock Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized (in shares) 450,000,000    
Key Associate Stock Plan | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units granted in period (in shares) 131,000,000    
Key Associate Stock Plan | Stock-settled Restricted Stock and Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units granted in period (in shares) 2,000,000