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Equity Equity (Details 3) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Amortization of defined benefit pension items [Abstract]  
Actuarial loss $ (49)
Total before tax (49)
Tax benefit 17
Total, net of tax (32)
Gain and losses on cash flow hedges [Abstract]  
Floating-to-fixed interest rate swaps 0
Currency exchange contracts 1
Commodity contracts 0
Tax expense 0
Total, net of tax 1
Total reclassification out of accumulated other comprehensive income, after tax $ (31)