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Netting Arrangements (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Assets:    
Derivative assets, gross amount $ 4,422 $ 5,168
Derivative asset, gross amount offset (4,272) (4,514)
Derivative assets, net amount presented in our consolidated balance sheets 150 654
Derivative assets, under master netting arrangements, amounts not offset in our consolidated balance sheets, financial instruments (117) (357)
Derivative assets, under master netting arrangements, amounts not offset in our consolidated balance sheets, collateral (1) (22)
Derivative assets, net amount 32 275
Securities purchased under agreements to resell, or similar arrangements, gross amount 44,670 51,115
Securities purchased under agreements to resell or similar arrangements, gross amount offset 0 0
Securities purchased under agreements to resell or similar arrangements, net amount presented in our consolidated balance sheets 44,670 51,115
Securities purchased under agreements to resell, under master netting arrangement, amounts not offset in our consolidated balance sheets, financial instruments 0 0
Securities purchased under agreements to resell or similar arrangements, under master netting arrangements, amounts not offset in our consolidated balance sheets, collateral (44,670) (51,115)
Securities purchased under agreements to resell or similar arrangements, net amount 0 0
Total assets, gross amount 49,092 56,283
Total assets, gross amount offset (4,272) (4,514)
Total assets, net amount presented in the consolidated balance sheets 44,820 51,769
Total assets, under the master netting arrangements, not offset in our consolidated balance sheets, financial instruments (117) (357)
Total assets, under master netting arrangements, not offset in our consolidated balance sheets, collateral (44,671) (51,137)
Total assets, net amount 32 275
Liabilities:    
Derivative liabilities, gross amount (5,306) (8,057)
Derivative liabilities, gross amount offset 4,979 6,844
Derivative liabilities, net amount presented in our consolidated balance sheets (327) (1,213)
Derivative liabilities, under master netting arrangements, amounts not offset in our consolidated balance sheets, financial instruments 117 357
Derivative liabilities, under master netting arrangements, amounts not offset in our consolidated balance sheets, collateral 104 107
Derivative liabilities, net amount (106) (749)
Total liabilities, gross amount (5,306) (8,057)
Total liabilities, gross amount offset 4,979 6,844
Total liabilities, net amount presented in our consolidated balance sheets (327) (1,213)
Total liabilities, under master netting arrangements, amounts not offset in our consolidated balance sheets, financial statements 117 357
Total liabilities, under master netting arrangements, amounts not offset in our consolidated balance sheets, collateral 104 107
Total liabilities, net amount (106) (749)
Risk management derivatives    
Assets:    
Derivative asset, gross amount offset (4,272) (4,514)
Liabilities:    
Derivative liabilities, gross amount offset 4,979 6,844
Mortgage commitment derivatives    
Assets:    
Derivative assets, gross amount 132 631
Derivative asset, gross amount offset 0 0
Derivative assets, net amount presented in our consolidated balance sheets 132 631
Derivative assets, under master netting arrangements, amounts not offset in our consolidated balance sheets, financial instruments (117) (357)
Derivative assets, under master netting arrangements, amounts not offset in our consolidated balance sheets, collateral (1) (22)
Derivative assets, net amount 14 252
Liabilities:    
Derivative liabilities, gross amount (228) (737)
Derivative liabilities, gross amount offset 0 0
Derivative liabilities, net amount presented in our consolidated balance sheets (228) (737)
Derivative liabilities, under master netting arrangements, amounts not offset in our consolidated balance sheets, financial instruments 117 357
Derivative liabilities, under master netting arrangements, amounts not offset in our consolidated balance sheets, collateral 93 16
Derivative liabilities, net amount (18) (364)
Over the Counter [Member] | Risk management derivatives    
Assets:    
Derivative assets, gross amount 2,479 3,688
Derivative asset, gross amount offset (2,464) (3,667)
Derivative assets, net amount presented in our consolidated balance sheets 15 21
Derivative assets, under master netting arrangements, amounts not offset in our consolidated balance sheets, financial instruments 0 0
Derivative assets, under master netting arrangements, amounts not offset in our consolidated balance sheets, collateral 0 0
Derivative assets, net amount 15 21
Liabilities:    
Derivative liabilities, gross amount (3,045) (4,905)
Derivative liabilities, gross amount offset 2,957 4,520
Derivative liabilities, net amount presented in our consolidated balance sheets (88) (385)
Derivative liabilities, under master netting arrangements, amounts not offset in our consolidated balance sheets, financial instruments 0 0
Derivative liabilities, under master netting arrangements, amounts not offset in our consolidated balance sheets, collateral 0 0
Derivative liabilities, net amount (88) (385)
Exchange Cleared [Member] | Risk management derivatives    
Assets:    
Derivative assets, gross amount 1,811 849
Derivative asset, gross amount offset (1,808) (847)
Derivative assets, net amount presented in our consolidated balance sheets 3 2
Derivative assets, under master netting arrangements, amounts not offset in our consolidated balance sheets, financial instruments 0 0
Derivative assets, under master netting arrangements, amounts not offset in our consolidated balance sheets, collateral 0 0
Derivative assets, net amount 3 2
Liabilities:    
Derivative liabilities, gross amount (2,033) (2,415)
Derivative liabilities, gross amount offset 2,022 2,324
Derivative liabilities, net amount presented in our consolidated balance sheets (11) (91)
Derivative liabilities, under master netting arrangements, amounts not offset in our consolidated balance sheets, financial instruments 0 0
Derivative liabilities, under master netting arrangements, amounts not offset in our consolidated balance sheets, collateral 11 91
Derivative liabilities, net amount $ 0 $ 0