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Stock-Based Compensation Plans (Schedule of Performance Stock Unit Activity) (Details) - Performance Stock Units [Member] - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options [Roll Forward]      
Stock-based compensation, balance at beginning of period, number of units (in units) [1] 723,533    
Stock-based compensation, granted, number of units (in units) 299,936    
Stock-based compensation, conversions to common stock, number of units (in units) (243,100)    
Stock-based compensation, forfeited, number of units (in units) (51,641)    
Stock-based compensation, balance at end of period, number of units (in units) [1] 728,728 [2],[3],[4] 723,533  
Stock-based compensation, balance at beginning of period, weighted-average grant-date fair value [1] $ 73.56    
Stock-based compensation, granted, weighted-average grant-date fair value 85.25 $ 71.62 $ 77.75
Stock-based compensation, conversions to common stock, weighted-average grant-date fair value 71.17    
Stock-based compensation, forfeited, weighted-average grant-date fair value 75.81    
Stock-based compensation, balance at end of period, weighted-average grant-date fair value [1] $ 79.01 [2],[3],[4] $ 73.56  
Stock-based compensation, weighted average remaining contractual term (in years) [1],[2],[3],[4] 1 year 2 months 4 days    
Stock-based compensation, aggregate intrinsic value [1] $ 66 [2],[3],[4] $ 61  
Performance stock units granted during period that are earned and subject to requisite service period (in units)   211,799 225,182
Performance stock units granted during period that may be earned and subject to requisite service period (in units) 291,747    
[1] All PSUs outstanding at December 31, 2020 and December 31, 2019, are unvested PSUs.
[2] Includes 211,799 PSUs granted in 2019 that are earned based on the Company’s achievement of EPS during the three-year performance period which ends December 31, 2021, and are subject to the requisite service period which ends February 1, 2022.
[3] Includes 225,182 PSUs granted in 2018 that are earned based on the Company’s achievement of earnings per share (“EPS”) during the three-year performance period which ends December 31, 2020, and are subject to the requisite service period which ended February 1, 2021.
[4] Includes 291,747 PSUs granted in 2020 that may be earned based on the Company’s achievement of EPS during the three-year performance period which ends December 31, 2022, and are subject to the requisite service period which ends February 1, 2023.