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Derivative Instruments - Additional Information (Detail) (USD $)
9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Interest rate contracts
Sep. 30, 2011
Interest rate contracts
Sep. 30, 2012
Interest rate contracts
Sep. 30, 2011
Interest rate contracts
Sep. 30, 2012
Foreign exchange contract
Sep. 30, 2011
Foreign exchange contract
Sep. 30, 2012
Foreign exchange contract
Sep. 30, 2011
Foreign exchange contract
Derivative [Line Items]                    
Forward commitments to sell mortgage loans $ 20,400,000,000                  
Hedged mortgage loans held for sale 9,800,000,000                  
Unfunded mortgage loan commitments 17,300,000,000                  
Collateral posted by counterparties netted against derivative assets 89,000,000 88,000,000                
Cash collateral posted by the Company netted against derivative liabilities 1,400,000,000 1,700,000,000                
Total notional value of asset and liability management derivative positions 65,500,000,000                  
Notional amount of asset and liability management derivative positions designated as fair value or cash flow or net investment hedge 12,000,000,000                  
Realized and unrealized losses on derivatives classified as cash flow hedges recorded in other comprehensive income (loss) 433,000,000 489,000,000                
Estimated loss to be reclassified from other comprehensive income (loss) into earnings during the remainder of the year 33,000,000                  
Estimated loss to be reclassified from other comprehensive income (loss) into earnings for next 12 months 132,000,000                  
Carrying amount of non-derivative debt instruments designated as net investment hedges 719,000,000                  
Gain losses on items hedged by fair value hedges     (2,000,000) (3,000,000) (5,000,000) (27,000,000) 0 117,000,000 (44,000,000) 20,000,000
Fair value of derivatives under collateral agreements in a net liability position 1,700,000,000                  
Collateral posted by company netted against net liability position $ 1,400,000,000