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Derivative gain (loss) recognized/reclassified (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Designated As Hedging Instruments [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, before Tax $ 27 $ 0
Amount of derivative gain (loss), recognized in OCI 47 5
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net 0 0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (4) 2
Derivative Instrument, Noninterest Income (Expense) 3 1
Total [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative gain recognized on undesignated derivatives 40 35
Interest Rate Floor [Member] | Designated As Hedging Instruments [Member] | Cash Flow Hedges [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, before Tax 27 0
Amount of derivative gain (loss), recognized in OCI 0 0
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net   0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 3 0
Derivative Instrument, Noninterest Income (Expense)   0
Interest Rate Contract [Member] | Designated As Hedging Instruments [Member] | Cash Flow Hedges [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, before Tax 0 0
Amount of derivative gain (loss), recognized in OCI 0 0
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net 0 0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0 0
Derivative Instrument, Noninterest Income (Expense) 3 1
Interest Rate Swaps [Member] | Designated As Hedging Instruments [Member] | Cash Flow Hedges [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, before Tax 0 0
Amount of derivative gain (loss), recognized in OCI 47 5
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net   0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ (7) 2
Derivative Instrument, Noninterest Income (Expense)   $ 0