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Netting Arrangements (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Offsetting Assets [Line Items]    
Fair Value of Securities Received as Collateral that Have Been Resold or Repledged $ 0 $ 0
Derivative Liability, Not Subject to Master Netting Arrangement 29 11
Assets:    
Derivative assets, gross amount 2,303 2,667
Derivative assets, gross amount offset (1,781) (2,266)
Derivative assets, net amount presented in our condensed consolidated balance sheets 522 401
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments (223) (153)
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral (14) (7)
Derivative assets, net amount 285 241
Securities purchased under agreements to resell or similar arrangements, gross amount 39,850 48,288
Securities purchased under agreements to resell or similar arrangements, gross amount offset 0 0
Securities Purchased under Agreements to Resell, Not Subject to Master Netting Arrangement 39,850 48,288
Securities purchased under agreements to resell or similar arrangements, under master netting arrangements, amounts not offset in our condensed 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 condensed consolidated balance sheets, collateral (39,850) (48,288)
Securities purchased under agreements to resell or similar arrangements, net amount 0 0
Total assets, gross amount 42,153 50,955
Total assets, gross amount offset (1,781) (2,266)
Total assets, net amount presented in our condensed consolidated balance sheets 40,372 48,689
Total assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments (223) (153)
Total assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral (39,864) (48,295)
Total assets, net amount 285 241
Liabilities:    
Derivative liabilities, gross amount (2,890) (3,081)
Derivative liabilities, gross amount offset 2,126 2,315
Derivative liabilities, net amount presented in our condensed consolidated balance sheets (764) (766)
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments 223 153
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral 426 489
Derivative liabilities, net amount (115) (124)
Total liabilities, gross amount (2,890) (3,081)
Total liabilities, gross amount offset 2,126 2,315
Total liabilities, net amount presented in our condensed consolidated balance sheets (764) (766)
Total liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments 223 153
Total liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral 426 489
Total liabilities, net amount (115) (124)
Fair Value of Securities Received as Collateral that Can be Resold or Repledged 33,900 45,700
Risk Management Derivatives    
Assets:    
Derivative assets, gross amount offset (1,781) (2,266)
Liabilities:    
Derivative liabilities, gross amount offset 2,126 2,315
Mortgage commitment derivatives    
Assets:    
Derivative assets, gross amount 439 379
Derivative assets, gross amount offset 0 0
Derivative assets, net amount presented in our condensed consolidated balance sheets 439 379
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments (223) (153)
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral (14) (7)
Derivative assets, net amount 202 219
Liabilities:    
Derivative liabilities, gross amount (666) (648)
Derivative liabilities, gross amount offset 0 0
Derivative liabilities, net amount presented in our condensed consolidated balance sheets (666) (648)
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments 223 153
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral 416 466
Derivative liabilities, net amount (27) (29)
Over the Counter [Member] | Risk Management Derivatives    
Assets:    
Derivative assets, gross amount 1,864 2,288
Derivative assets, gross amount offset (1,801) (2,273)
Derivative assets, net amount presented in our condensed consolidated balance sheets 63 15
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments 0 0
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral 0 0
Derivative assets, net amount 63 15
Liabilities:    
Derivative liabilities, gross amount (2,224) (2,433)
Derivative liabilities, gross amount offset 2,143 2,342
Derivative liabilities, net amount presented in our condensed consolidated balance sheets (81) (91)
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments 0 0
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral 0 0
Derivative liabilities, net amount (81) (91)
Exchange Cleared [Member] | Risk Management Derivatives    
Assets:    
Derivative assets, gross amount 0 0
Derivative assets, gross amount offset 20 7
Derivative assets, net amount presented in our condensed consolidated balance sheets 20 7
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments 0 0
Derivative assets, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral 0 0
Derivative assets, net amount 20 7
Liabilities:    
Derivative liabilities, gross amount 0 0
Derivative liabilities, gross amount offset (17) (27)
Derivative liabilities, net amount presented in our condensed consolidated balance sheets (17) (27)
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, financial instruments 0 0
Derivative liabilities, under master netting arrangements, amounts not offset in our condensed consolidated balance sheets, collateral 10 23
Derivative liabilities, net amount $ (7) $ (4)