Derivative Instruments - Cumulative Fair Value Hedging Adjustments (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Cumulative amount of fair value hedging adjustments included in the carrying amount of hedged items
Cumulative basis adjustments for active hedging relationships	$ 641	$ (1,153)
Commodity
Assets
Carrying amount of the hedged items	22,900	6,200
Long-term debt
Liabilities
Carrying amount of the hedged items	222,611	211,288
Cumulative amount of fair value hedging adjustments included in the carrying amount of hedged items
Active hedging relationships	232	(3,711)
Discontinued hedging relationships	(8,689)	(9,332)
Total	(8,457)	(13,043)
Long-term debt | Not designated as hedges
Liabilities
Carrying amount of the hedged items	587	518
Beneficial interests issued by consolidated VIEs
Liabilities
Carrying amount of the hedged items	5,884	5,312
Cumulative amount of fair value hedging adjustments included in the carrying amount of hedged items
Active hedging relationships	37	(30)
Discontinued hedging relationships	0	(5)
Total	37	(35)
Investment securities - AFS
Assets
Carrying amount of the hedged items	255,109	203,141
Cumulative amount of fair value hedging adjustments included in the carrying amount of hedged items
Active hedging relationships	3,693	(1,675)
Discontinued hedging relationships	(1,374)	(1,959)
Total	2,319	(3,634)
Cumulative amount of fair value hedging adjustments included in the carrying amount of hedged items
Amortized cost of the closed portfolio	91,900	72,800
Designated hedged items in active hedging relationships	68,900	41,200
Cumulative basis adjustments	(32)	(1,700)
Cumulative basis adjustments for active hedging relationships	641	(1,200)
Cumulative basis adjustments for discontinued hedging relationships	(673)	(566)
Investment securities - AFS | Not designated as hedges
Assets
Carrying amount of the hedged items	$ 33,600	$ 28,700