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Stock-Based Compensation - RSU, RS, Performance Shares (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Restricted Stock Units and Restricted Stock      
Unit and Shares Activity:      
Number of Awards - Nonvested - Beginning balance 2,817,786 3,105,361 3,261,562
Number of Awards - Granted - Annual 671,204 798,615 946,774
Number of Awards - Granted - Other 26,886 78,252 44,401
Number of Awards - Vested (1,010,612) (1,100,675) (1,100,095)
Number of Awards - Forfeited (64,176) (63,767) (47,281)
Number of Awards - Nonvested - Ending balance 2,441,088 2,817,786 3,105,361
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures      
Weighted Average Grant Date Fair Value - Nonvested - Beginning balance $ 104.41 $ 92.31 $ 85.17
Weighted Average Grant Date Fair Value - Granted - Annual 165.86 126.79 101.57
Weighted Average Grant Date Fair Value - Granted - Other 156.94 152.74 111.19
Weighted Average Grant Date Fair Value - Vested 89.99 90.37 79.93
Weighted Average Grant Date Fair Value - Forfeited 118.99 97.23 90.82
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 127.47 $ 104.41 $ 92.31
Compensation expense yet to be recognized $ 84,000,000    
Expense recognition period 24 months    
Fair value that vested $ 166,000,000 $ 145,000,000 $ 114,000,000
Tax benefit realized from vesting $ 62,000,000 $ 54,000,000 $ 43,000,000
Vesting or performance period 3 years    
Value of dividend equivalents for restricted stock units that are forfeited $ 0    
Impact on basic earnings per share due to restricted stock units dividends $ 0    
Performance Shares      
Unit and Shares Activity:      
Number of Awards - Nonvested - Beginning balance 1,099,752 895,635 1,089,084
Number of Awards - Granted - Annual 227,798 305,225 353,734
Number of Awards - Vested (323,938) (277,358) (507,083)
Number of Awards - Performance Change (106,760) 212,461 (6,949)
Number of Awards - Forfeited (25,660) (36,212) (33,151)
Number of Awards - Nonvested - Ending balance 871,192 1,099,752 895,635
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures      
Weighted Average Grant Date Fair Value - Nonvested - Beginning balance $ 102.65 $ 88.12 $ 79.27
Weighted Average Grant Date Fair Value - Granted - Annual 158.88 124.89 96.87
Weighted Average Grant Date Fair Value - Vested 83.08 84.74 75.16
Weighted Average Grant Date Fair Value - Performance Change 127.70 109.74 77.01
Weighted Average Grant Date Fair Value - Forfeited 125.33 109.44 91.34
Weighted Average Grant Date Fair Value - Nonvested - Ending balance $ 120.89 $ 102.65 $ 88.12
Compensation expense yet to be recognized $ 17,000,000    
Expense recognition period 10 months    
Fair value that vested $ 54,000,000 $ 35,000,000 $ 52,000,000
Tax benefit realized from vesting $ 15,000,000 $ 11,000,000 $ 16,000,000
Vesting or performance period 3 years    
Performance Shares | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures      
Expense recognition period 3 years    
Number of shares to be delivered based on percent of each performance share granted upon satisfaction of performance conditions 200.00%    
Performance Shares | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures      
Expense recognition period 1 year    
Number of shares to be delivered based on percent of each performance share granted upon satisfaction of performance conditions 0.00%