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Derivative Financial Instruments - Fair Value Hedges Basis Adjusments (Details) - Fair Value Hedges - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
AFS securities    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Asset / Liability Basis $ 485 $ 533
AFS securities | Items Currently Designated    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedge Basis Adjustment (3) 64
AFS securities | Items No Longer Designated    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedge Basis Adjustment 55 10
Loans and leases    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Asset / Liability Basis 568 511
Loans and leases | Items Currently Designated    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedge Basis Adjustment (12) (5)
Loans and leases | Items No Longer Designated    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedge Basis Adjustment (3) 0
Long-term debt    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Asset / Liability Basis 15,232 16,917
Long-term debt | Items Currently Designated    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedge Basis Adjustment (269) (49)
Long-term debt | Items No Longer Designated    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedge Basis Adjustment $ 20 $ 140