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Capital Stock (Schedule of Issued Repurchased and Outstanding Shares) (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Common Stock, Shares Outstanding [Roll Forward]      
Beginning balance, Shares Issued 2,805,961,317us-gaap_CommonStockSharesIssued 2,805,961,317us-gaap_CommonStockSharesIssued 2,805,961,317us-gaap_CommonStockSharesIssued
Beginning balance, Shares Repurchased (812,482,035)us-gaap_TreasuryStockShares (796,221,021)us-gaap_TreasuryStockShares (761,542,032)us-gaap_TreasuryStockShares
Beginning balance, Shares Outstanding 1,993,479,282us-gaap_CommonStockSharesOutstanding 2,009,740,296us-gaap_CommonStockSharesOutstanding 2,044,419,285us-gaap_CommonStockSharesOutstanding
Stock award activity 447,840us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued 391,899us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued 181,011us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued
Repurchase of common stock, shares (22,452,599)us-gaap_TreasuryStockSharesAcquired (16,652,913)us-gaap_TreasuryStockSharesAcquired (34,860,000)us-gaap_TreasuryStockSharesAcquired
Ending balance, Shares Issued 2,805,961,317us-gaap_CommonStockSharesIssued 2,805,961,317us-gaap_CommonStockSharesIssued 2,805,961,317us-gaap_CommonStockSharesIssued
Ending balance, Shares Repurchased (834,486,794)us-gaap_TreasuryStockShares (812,482,035)us-gaap_TreasuryStockShares (796,221,021)us-gaap_TreasuryStockShares
Ending balance, Shares Outstanding 1,971,474,523us-gaap_CommonStockSharesOutstanding 1,993,479,282us-gaap_CommonStockSharesOutstanding 2,009,740,296us-gaap_CommonStockSharesOutstanding