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Capital Stock (Schedule of Issued Repurchased and Outstanding Shares) (Details) - shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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) (862,689,093) (845,901,836) (834,486,794)
Beginning balance, Shares Outstanding (in shares) 1,943,272,224 1,960,059,481 1,971,474,523
Stock award activity (in shares) (408,891) (566,256) (732,623)
Repurchases of common stock (in shares) (41,604,141) (16,221,001) (10,682,419)
Ending balance, Shares Issued (in shares) 2,805,961,317 2,805,961,317 2,805,961,317
Ending balance, Shares Repurchased (in shares) (904,702,125) (862,689,093) (845,901,836)
Ending balance, Shares Outstanding (in shares) 1,901,259,192 1,943,272,224 1,960,059,481