Derivative Instruments - Cumulative Fair Value Hedging Adjustments (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Commodity
Assets
Carrying amount of the hedged items	$ 25,700	$ 11,500
Long-term debt
Liabilities
Carrying amount of the hedged items	195,642	177,611
Cumulative amount of fair value hedging adjustments included in the carrying amount of hedged items:
Active hedging relationships	(1,999)	3,194
Discontinued hedging relationships	8,834	11,473
Total	6,835	14,667
Long-term debt | Not designated as hedges
Liabilities
Carrying amount of the hedged items	10,800	6,600
Beneficial interests issued by consolidated VIEs
Liabilities
Carrying amount of the hedged items	749	746
Cumulative amount of fair value hedging adjustments included in the carrying amount of hedged items:
Active hedging relationships	0	0
Discontinued hedging relationships	(1)	(3)
Total	(1)	(3)
Investment securities - AFS
Assets
Carrying amount of the hedged items	65,746	139,684
Cumulative amount of fair value hedging adjustments included in the carrying amount of hedged items:
Active hedging relationships	417	3,572
Discontinued hedging relationships	661	847
Total	1,078	4,419
Investment securities - AFS | Not designated as hedges
Assets
Carrying amount of the hedged items	$ 14,000	$ 14,500