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Redeemable Noncontrolling Interest (Movement in Redeemable Noncontrolling Interest after Business Combination) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Increase (Decrease) in Temporary Equity [Roll Forward]  
Redeemable noncontrolling interest at beginning of period $ 1,301
Share of net earnings 67
Redeemable noncontrolling interest at end of period 1,296
Redeemable Noncontrolling Interest [Member]
 
Increase (Decrease) in Temporary Equity [Roll Forward]  
Dividend payments (48)
Currency translation losses $ (24)