Derivative Instruments and Hedging Activities (Narrative) (Details)	Dec. 31, 2022 USD ($) derivative_instrument	Dec. 31, 2021 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	$ 24,498,000,000	$ 22,610,000,000
Redesignated swaps, unamortized basis adjustments	10,000,000
Derivative liability, fair value	451,000,000	51,000,000
Cash collateral pledged for derivative liabilities	152,000,000
Additional collateral that would be required to be pledge if credit rating was downgraded by one notch	0
Other liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability, fair value	451,000,000	51,000,000
Derivatives designated as hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	9,361,000,000	7,862,000,000
Derivatives designated as hedges | Other liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability, fair value	1,000,000	0
Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Redesignated swaps, unamortized basis adjustments	$ 1,000,000
Fair Value Hedging | Derivatives designated as hedges | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate derivatives remaining | derivative_instrument	1
Derivative, notional amount	$ 500,000,000	500,000,000
Fair Value Hedging | Derivatives designated as hedges | Asset hedges: Pay-fixed interest rate swaps 1
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	1,228,000,000	479,000,000
Fair Value Hedging | Derivatives designated as hedges | Other liabilities | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability, fair value	0	0
Fair Value Hedging | Derivatives designated as hedges | Other liabilities | Asset hedges: Pay-fixed interest rate swaps 1
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability, fair value	0	0
Cash Flow Hedging | Derivatives designated as hedges
Derivative Instruments, Gain (Loss) [Line Items]
Deferred gain (loss) in OCI	410,000,000
Cash Flow Hedging | Derivatives designated as hedges | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	7,633,000,000	6,883,000,000
Cash Flow Hedging | Derivatives designated as hedges | Other liabilities | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability, fair value	$ 1,000,000	$ 0