Derivative Instruments - Cumulative Fair Value Hedging Adjustments (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Cumulative amount of fair value hedging adjustments included in the carrying amount of hedged items:
Total cumulative basis adjustments	$ 21.0
Commodity contracts
Assets
Carrying amount of the hedged items	14,600.0	$ 26,000.0
Long-term debt
Liabilities
Carrying amount of the hedged items	172,238.0	175,257.0
Cumulative amount of fair value hedging adjustments included in the carrying amount of hedged items:
Active hedging relationships	(7,215.0)	(11,879.0)
Discontinued hedging relationships	(5,592.0)	(3,313.0)
Total	(12,807.0)	(15,192.0)
Long-term debt | Not designated as hedges
Liabilities
Carrying amount of the hedged items	217.0	221.0
Investment securities
Assets
Carrying amount of the hedged items	119,145.0	84,073.0
Cumulative amount of fair value hedging adjustments included in the carrying amount of hedged items:
Active hedging relationships	(2,658.0)	(4,149.0)
Discontinued hedging relationships	(1,449.0)	(1,542.0)
Total	(4,107.0)	(5,691.0)
Cumulative amount of fair value hedging adjustments included in the carrying amount of hedged items:
Amortized cost of the closed portfolio	38,900.0
Designated hedged items in active hedging relationships	24,500.0
Total cumulative basis adjustments	21.0
Investment securities | Not designated as hedges
Assets
Carrying amount of the hedged items	$ 19,900.0	$ 20,300.0