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Stock-based Compensation (Schedule of Stock Option Activities) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Stock Options [Member]    
Stock Option Activity [Abstract]    
Stock options, shares outstanding at January 1, 2021 2,569  
Stock options, shares granted 387  
Stock options, shares exercised (356)  
Stock options, shares forfeited or expired (90)  
Stock options, shares outstanding at September 30, 2021 2,510 2,569
Stock options, shares vested or expected to vest at September 30, 2021 2,486  
Stock options, shares exercisable at September 30, 2021 1,731  
Stock options weighted-average exercise price, outstanding at January 1, 2021 $ 132.49  
Stock options weighted-average exercise price, granted 204.45  
Stock options weighted-average exercise price, exercised 121.82  
Stock options weighted-average exercise price, forfeited or expired 159.45  
Stock options weighted-average exercise price, outstanding at September 30, 2021 144.13 $ 132.49
Stock options weighted-average exercise price, vested or expected to vest at September 30, 2021 143.82  
Stock options weighted-average exercise price, options exercisable at September 30, 2021 $ 123.54  
Stock options weighted-average remaining contractual term in years, outstanding at January 1, 2021 6 years 2 months 12 days 6 years 4 months 24 days
Stock options weighted-average remaining contractual term in years, outstanding at September 30, 2021 6 years 2 months 12 days 6 years 4 months 24 days
Stock options weighted-average remaining contractual term in years, vested or expected to vest at September 30, 2021 6 years 2 months 12 days  
Stock options weighted-average remaining contractual term in years, options exercisable at September 30, 2021 5 years 1 month 6 days  
Stock options aggregate intrinsic value, outstanding at January 1, 2021 $ 195  
Stock options aggregate intrinsic value, outstanding at September 30, 2021 133 $ 195
Stock options aggregate intrinsic value, vested or expected to vest at September 30, 2021 133  
Stock options aggregate intrinsic value, options exercisable at September 30, 2021 $ 125  
Retention Awards [Member]    
Awards Activity [Abstract]    
Awards, shares nonvested at January 1, 2021 1,476  
Awards, shares granted 289  
Awards, shares vested (414)  
Awards, shares forfeited (53)  
Awards, shares nonvested at September 30, 2021 1,298 1,476
Awards weighted-average grant-date fair value, nonvested at January 1, 2021 $ 141.06  
Awards weighted-average grant-date fair value, granted 205.10  
Awards weighted-average grant-date fair value, vested 108.32  
Awards weighted-average grant-date fair value, forfeited 162.23  
Awards weighted-average grant-date fair value, nonvested at September 30, 2021 $ 164.90 $ 141.06
Performance Retention Awards [Member]    
Awards Activity [Abstract]    
Awards, shares nonvested at January 1, 2021 773  
Awards, shares granted 227  
Awards, shares vested (147)  
Awards, shares unearned (165)  
Awards, shares forfeited (41)  
Awards, shares nonvested at September 30, 2021 647 773
Awards weighted-average grant-date fair value, nonvested at January 1, 2021 $ 148.17  
Awards weighted-average grant-date fair value, granted 204.45  
Awards weighted-average grant-date fair value, vested 132.66  
Awards weighted-average grant-date fair value, unearned 135.57  
Awards weighted-average grant-date fair value, forfeited 183.55  
Awards weighted-average grant-date fair value, nonvested at September 30, 2021 $ 172.41 $ 148.17