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Share-based Incentive Plans Stock Options and Incentive Plans (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation expense $ 39,000,000 $ 52,000,000 $ 47,000,000
Share based compensation related income tax benefits recognized in earnings 14,000,000 $ 18,000,000 $ 16,000,000
Compensation cost not yet recognized $ 49,000,000    
Compensation cost not yet recognized, period for recognition 27 months    
Number of shares available for grant (in shares) 5,800,000    
Grants in period, weighted average grant date fair value (USD per share) $ 31.21 $ 63.40 $ 42.09
Weighted average grant date fair value (USD per share) $ 127.88 $ 155.37 $ 133.31
Total fair value, options vested in period $ 33,000,000 $ 41,000,000 $ 25,000,000
Nonemployee director equity award $ 125,000    
Nonemployee director one-time shares granted (in shares) 1,000    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Terms of award 10 years    
Intrinsic Value $ 20,000,000 48,000,000 36,000,000
Tax benefit from stock options exercised 7,000,000 18,000,000 13,000,000
Proceeds from stock options exercised $ 26,000,000 $ 38,000,000 $ 38,000,000
Restricted Stock Units (RSUs) | Management      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Restricted Stock Units (RSUs) | Executives | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Restricted Stock Units (RSUs) | Executives | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 7 years    
Performance Stock Units | Management      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Performance Stock Units | Management | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance measures 0.00%    
Performance Stock Units | Management | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance measures 200.00%