Quarterly report pursuant to Section 13 or 15(d)

Amount and Location in the Income Statement for Derivatives Designed as Cash Flow Hedges (Detail)

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Amount and Location in the Income Statement for Derivatives Designed as Cash Flow Hedges (Detail) (Cash Flow Hedging, USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) $ (84) $ (49) $ (151) $ (134)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (15) (41) (16) (25)
Interest Rate Contracts | Interest Expense
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) (53) (1) (61) (1)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (5) (5) (10) (10)
Foreign Exchange Contracts | Interest Expense
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) (113) (21) (72) (3)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) (19) (3) (3) 31
Foreign Exchange Contracts | Other Operating Expense
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) (10) (5) (15) (5)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) 0 0 0 0
Foreign Exchange Contracts | Revenue
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) 92 (31) (3) (134)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) 9 (42) (3) (55)
Commodity Contracts | Fuel Expense
        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) 0 9 0 9
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) $ 0 $ 9 $ 0 $ 9