Derivative Financial Instruments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025
Derivative [Line Items]
Reclassified terminated cash flow hedges net losses		$ 29
Cash flow hedge gains to be reclassified within twelve months		27
Terminated hedge loss expected to be reclassified		$ 17
Maximum length of time hedged in cash flow hedge		5 years
Derivative liabilities		$ 25,577	$ 14,261
Forecast
Derivative [Line Items]
Reclassified terminated cash flow hedges net losses	$ 11
Interest rate swap | Fair Value Hedges
Derivative [Line Items]
Notional amount		36,940	$ 36,120
Credit swap agreements
Derivative [Line Items]
Derivative liabilities		7,640
Cash collateral provided for derivative instruments		6,320
Maximum additional amount of payments related to termination events		$ 1,320