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Consolidated Statement of Changes in Equity (Parenthetical) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]      
Common Stock issued under employee plans, shares 3.7 6.2 10.4
Tax benefit from Common Stock issued under employee plans $ 64 $ 103 $ 115
Common Stock repurchased, shares 88.7 13.5 12.6
Long Term Debt Remarketing, Number of Shares Issued 11.3    
Stock Issued During Period, Shares, Employee Benefit Plan 2.7