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 $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
In Text Details [Abstract]        
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months $ 936      
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months, Net of Tax 589      
Loss, Net Investment Hedge Related to Foreign Exchange Risk Excluded From Accumulated Other Comprehensive Income   7    
Cash Flow Hedging [Member]
        
Cash Flow Hedges And Net Investment Hedges [Abstract]        
Gain (losses) Recognized in Accumulated OCI on Derivatives (166) (374) (125) 38
Gains (losses) in Income Reclassified from Accumulated OCI (186) (246) (421) (440)
Hedge Ineffectiveness and Amounts Excluded from Effectiveness Testing (1) [1]   (2) [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 (276) (160) (290) (53)
Gains (losses) in Income Reclassified from Accumulated OCI (255) (224) (530) (376)
Hedge Ineffectiveness and Amounts Excluded from Effectiveness Testing (1) [1]   (2) [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   2   (3)
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 110 (214) 165 91
Gains (losses) in Income Reclassified from Accumulated OCI 69 (24) 109 (61)
Foreign Exchange Risk [Member] | Net Investment Hedging [Member]
        
Cash Flow Hedges And Net Investment Hedges [Abstract]        
Gain (losses) Recognized in Accumulated OCI on Derivatives 804 1,157 2,480 128
Gains (losses) in Income Reclassified from Accumulated OCI 3 4 (91) (37)
Hedge Ineffectiveness and Amounts Excluded from Effectiveness Testing $ (37) [1] $ (160) [1] $ (72) [1] $ (167) [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.