Quarterly report pursuant to Section 13 or 15(d)

Derivatives - Derivatives Designated as Accounting Hedges - Cash Flow Hedges (Details)

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Derivatives - Derivatives Designated as Accounting Hedges - Cash Flow Hedges (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
In Text Details [Abstract]    
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months $ 900,000,000  
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months, Net of Tax (596,000,000)  
Loss, Net Investment Hedge Related to Foreign Exchange Risk Excluded From Accumulated Other Comprehensive Income   7,000,000
Cash Flow Hedging [Member]
    
Cash Flow Hedges And Net Investment Hedges [Abstract]    
Gain (losses) Recognized in Accumulated OCI on Derivatives 41,000,000 413,000,000
Gains (losses) in Income Reclassified from Accumulated OCI (235,000,000) (194,000,000)
Hedge Ineffectiveness and Amounts Excluded from Effectiveness Testing (1,000,000) [1]  
Interest Rate Risk on Variable Rate Portfolios [Member] | Cash Flow Hedging [Member]
    
Cash Flow Hedges And Net Investment Hedges [Abstract]    
Gain (losses) Recognized in Accumulated OCI on Derivatives (14,000,000) 108,000,000
Gains (losses) in Income Reclassified from Accumulated OCI (275,000,000) (152,000,000)
Hedge Ineffectiveness and Amounts Excluded from Effectiveness Testing (1,000,000) [1]  
Commodity price risk on commodity inventory [Member] | Cash Flow Hedging [Member]
    
Cash Flow Hedges And Net Investment Hedges [Abstract]    
Gains (losses) in Income Reclassified from Accumulated OCI   (5,000,000)
Price risk on restricted stock awards [Member] | Cash Flow Hedging [Member]
    
Cash Flow Hedges And Net Investment Hedges [Abstract]    
Gain (losses) Recognized in Accumulated OCI on Derivatives 55,000,000 305,000,000
Gains (losses) in Income Reclassified from Accumulated OCI 40,000,000 (37,000,000)
Foreign Exchange Risk [Member] | Net Investment Hedging [Member]
    
Cash Flow Hedges And Net Investment Hedges [Abstract]    
Gain (losses) Recognized in Accumulated OCI on Derivatives 1,676,000,000 (1,029,000,000)
Gains (losses) in Income Reclassified from Accumulated OCI (94,000,000) (41,000,000)
Hedge Ineffectiveness and Amounts Excluded from Effectiveness Testing $ (35,000,000) [1] $ (7,000,000) [1]
[1] Amounts related to derivatives designated as cash flow hedges represent hedge ineffectiveness and amounts related to net investment hedges represent amounts excluded from effectiveness testing.