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Fair Values (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Investment securities:    
Equity securities $ 47 $ 48
Debt securities 6,410 4,599
Derivative assets 255 514
AssetsFairValueDisclosure 6,712 5,161
Liabilities    
Derivative liabilities 362 214
LiabilitiesFairValueDisclosure 362 214
Level 1 [Member]    
Investment securities:    
Equity securities 1 1
Debt securities 0 0
Derivative assets 0 0
AssetsFairValueDisclosure 1 1
Liabilities    
Derivative liabilities 0 0
LiabilitiesFairValueDisclosure 0 0
Level 2 [Member]    
Investment securities:    
Equity securities 46 47
Debt securities 6,410 4,599
Derivative assets 255 514
AssetsFairValueDisclosure 6,711 5,160
Liabilities    
Derivative liabilities 362 214
LiabilitiesFairValueDisclosure 362 214
Level 3 [Member]    
Investment securities:    
Equity securities 0 0
Debt securities 0 0
Derivative assets 0 0
AssetsFairValueDisclosure 0 0
Liabilities    
Derivative liabilities 0 0
LiabilitiesFairValueDisclosure $ 0 $ 0