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Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Deferred tax assets:    
Allowance for loan losses and basis in acquired property, net $ 26,263,000,000 $ 29,935,000,000
Mortgage and mortgage-related assets 14,912,000,000 12,358,000,000
Debt and derivative instruments 5,450,000,000 6,562,000,000
Partnership credits 5,933,000,000 5,473,000,000
Partnership and other equity investments 1,610,000,000 1,809,000,000
Unrealized losses on AFS securities, net 0 442,000,000
Net operating loss and alternative minimum tax credit carryforwards 2,586,000,000 5,904,000,000
Other, net 2,084,000,000 2,053,000,000
Total deferred tax assets 58,838,000,000 64,536,000,000
Deferred tax liabilities:    
Unrealized gains on AFS securities, net 496,000,000 0
Other, net 0 23,000,000
Total deferred tax liabilities 496,000,000 23,000,000
Valuation allowance (58,851,000,000) (64,080,000,000)
Net deferred tax (liabilities) assets (509,000,000) 433,000,000
Net operating loss carryforwards subject to expiration 8,300,000,000  
Capital loss carryforwards 1,500,000,000  
Alternative minimum tax credit carryforwards that have an indefinite carryforward period $ 344,000,000