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Derivative Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2014
Derivative [Line Items]        
Realized and unrealized losses on derivatives classified as cash flow hedges recorded in other comprehensive income (loss)     $ 119,000,000 $ 172,000,000
Non-derivative debt instruments designated as net investment hedges     0 $ 0
Fair value of derivatives under collateral agreements in a net liability position     1,100,000,000  
Collateral posted by company netted against net liability position     925,000,000  
Forward commitments to sell mortgage loans     6,800,000,000  
Hedged mortgage loans held for sale     3,000,000,000  
Unfunded mortgage loan commitments     $ 4,900,000,000  
Scenario, Forecast [Member]        
Derivative [Line Items]        
Estimated loss to be reclassified from other comprehensive income (loss) into earnings $ 30,000,000 $ 94,000,000