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Securities - Fair Value of Debt Securities AFS Contractual Maturity (Details)
$ in Millions
Dec. 31, 2015
USD ($)
Securities available for sale  
One Year or Less $ 73
Over One Year Through Five Years 394
Over Five Years Through Ten Years 3,492
Over Ten Years 10,377
Total Fair Value 14,336
US Treasury Securities  
Securities available for sale  
One Year or Less 0
Over One Year Through Five Years 0
Over Five Years Through Ten Years 594
Over Ten Years 0
Total Fair Value 594
Residential mortgage-backed securities, U.S. government agency and government-sponsored agencies  
Securities available for sale  
One Year or Less 0
Over One Year Through Five Years 19
Over Five Years Through Ten Years 388
Over Ten Years 6,794
Total Fair Value 7,201
Residential mortgage-backed securities, Privately issued  
Securities available for sale  
One Year or Less 0
Over One Year Through Five Years 3
Over Five Years Through Ten Years 0
Over Ten Years 148
Total Fair Value 151
Commercial Mortgage Backed Securities Private Issue [Member]  
Securities available for sale  
One Year or Less 0
Over One Year Through Five Years 0
Over Five Years Through Ten Years 36
Over Ten Years 1,510
Total Fair Value 1,546
Collateralized loan obligations  
Securities available for sale  
One Year or Less 0
Over One Year Through Five Years 16
Over Five Years Through Ten Years 1,804
Over Ten Years 1,413
Total Fair Value 3,233
Other Asset Liability Management Securities, Other  
Securities available for sale  
One Year or Less 0
Over One Year Through Five Years 2
Over Five Years Through Ten Years 5
Over Ten Years 0
Total Fair Value 7
Asset Liability Management securities  
Securities available for sale  
One Year or Less 0
Over One Year Through Five Years 40
Over Five Years Through Ten Years 2,827
Over Ten Years 9,865
Total Fair Value 12,732
Other debt securities, Direct bank purchase bonds  
Securities available for sale  
One Year or Less 73
Over One Year Through Five Years 353
Over Five Years Through Ten Years 665
Over Ten Years 481
Total Fair Value 1,572
Other debt securities, Other  
Securities available for sale  
One Year or Less 0
Over One Year Through Five Years 1
Over Five Years Through Ten Years 0
Over Ten Years 31
Total Fair Value $ 32