Derivative and Hedging Activities - Information about Interest Rate Swaps Designated as Cash Flow Hedges (Details) - Interest Rate Swap - Cash Flow Hedging - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Notional amounts	$ 2,250	$ 2,250
Cash collateral posted	$ 12	$ 46
Weighted average pay rates	1.27%	1.27%
Weighted average receive rates	0.18%	0.23%
Weighted average maturity	10 months 24 days	1 year 10 months 24 days