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Capital Stock (Schedule of Issued Repurchased and Outstanding Shares) (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Common Stock, Shares Outstanding [Roll Forward]      
Beginning balance, Shares Issued (in shares) 2,805,961,317 2,805,961,317 2,805,961,317
Beginning balance, Shares Repurchased (in shares) (947,979,763) (931,903,722) (904,702,125)
Beginning balance, Shares Outstanding (in shares) 1,857,981,554 1,874,057,595 1,901,259,192
Stock award activity (in shares) 437,611 427,276 676,727
Repurchases of common stock (in shares)   (16,503,317) (27,878,324)
Ending balance, Shares Issued (in shares) 2,805,961,317 2,805,961,317 2,805,961,317
Ending balance, Shares Repurchased (in shares) (947,542,152) (947,979,763) (931,903,722)
Ending balance, Shares Outstanding (in shares) 1,858,419,165 1,857,981,554 1,874,057,595