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Income Taxes Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Deferred Tax Assets, Tax Credit Carryforwards $ 161  
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax 136  
Deferred tax assets:    
Mortgage and mortgage-related assets 9,285 $ 10,397
Allowance for loan losses and basis in acquired property, net 2,065 2,286
Debt and derivative instruments 687 1,205
Partnership credits 161 1,695
Partnership and other equity investments 223 311
Other, net 840 1,621
Total deferred tax assets 13,261 17,515
Deferred tax liabilities:    
Unrealized gains on AFS securities, net 73 165
Total deferred tax liabilities 73 165
Net deferred tax assets $ 13,188 $ 17,350