Derivative and Hedging Activities - Information Regarding Derivative Financial Instruments (Details) $ in Millions	Dec. 31, 2022 USD ($)
Derivative [Line Items]
Amount of designated hedged items	$ 2,300
Designated as Hedging Instrument
Derivative [Line Items]
Amount of designated hedged items	0
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Amount of designated hedged items	3,711
Derivative Assets, Notional Amount	11,403
Derivative Assets, Fair Value	220
Derivative Liabilities, Fair Value	126
Other Assets | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Fair Value	229
Other Liabilities | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Fair Value	136
Fair Value Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Amount of designated hedged items	3,750
Fair Value Hedging | Other Assets | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Fair Value	5
Interest Rate Swap | Designated as Hedging Instrument
Derivative [Line Items]
Amount of designated hedged items	2,000
Interest Rate Swap | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Fair Value	65	[1]
Interest Rate Swap | Fair Value Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Amount of designated hedged items	3,750
Interest Rate Swap | Fair Value Hedging | Other Assets | Designated as Hedging Instrument
Derivative [Line Items]
Derivative, Fair Value	5
Futures | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Notional Amount	1,205
Derivative Assets, Fair Value	2
Futures | Other Assets | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Fair Value	2
Mortgage-backed Securities Forwards | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Notional Amount	1,065
Derivative Liabilites, Notional Amount	739
Derivative Assets, Fair Value	36
Derivative Liabilities, Fair Value	61
Mortgage-backed Securities Forwards | Other Assets | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Fair Value	36
Mortgage-backed Securities Forwards | Other Liabilities | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Fair Value	61
Rate Lock Commitments | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Notional Amount	1,539
Derivative Liabilites, Notional Amount	527
Rate Lock Commitments | Other Assets | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Fair Value	9
Rate Lock Commitments | Other Liabilities | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Fair Value	10
Interest Rate Swaps and Swaptions | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Notional Amount	7,594
Derivative Liabilites, Notional Amount	2,445
Interest Rate Swaps and Swaptions | Other Assets | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Fair Value	182
Interest Rate Swaps and Swaptions | Other Liabilities | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Fair Value	$ 65

[1] Variation margin pledged to, or received from, a Central Counterparty Clearing House to cover the prior days fair value of open positions is considered settlement of the derivative position for accounting purposes.