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Share-Based Incentive Compenstaion (Details) - Cost Recognition - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based compensation      
Total compensation cost recognized in earnings for all share-based incentive compensation awards $ 148 $ 142 $ 140
Tax benefit recognized in earnings related to compensation costs 25 26 26
Total unrecognized compensation cost related to all nonvested share-based incentive compensation awards $ 133    
Weighted-average period of recognition for unrecognized compensation cost (in years) 1 year 8 months 12 days    
Cash received from the exercise of employee stock options under share-based compensation plans $ 127 213 132
Tax benefit for tax deductions from employee stock options exercised $ 10 18 14
Minimum [Member]      
Share-based compensation      
Estimated annual forfeiture rate reflected in share-based compensation cost (percent) 3.50%    
Maximum [Member]      
Share-based compensation      
Estimated annual forfeiture rate reflected in share-based compensation cost (percent) 4.50%    
Performance shares [Member]      
Share-based compensation      
Estimated attainment of performance shares at grant date (percent) 100.00%    
Compensation cost adjustments for the updated estimate of performance shares due to attaining certain performance levels $ 3 $ 2 $ 3