Derivative Instruments - Impact on Statements of Income, Fair Value Hedges (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Gains/(losses) recorded in income
Derivatives	$ (7,111)	$ 6,191
Hedged items	7,481	(5,758)
Income statement impact	370	433
Income statement impact of excluded components:
Amortization approach	(78)	(179)
Changes in fair value	466	351
OCI impact
Derivatives - Gains/(losses) recorded in OCI	(37)	115
Interest rate
Gains/(losses) recorded in income
Derivatives	(5,121)	4,087
Hedged items	5,446	(3,788)
Income statement impact	325	299
Income statement impact of excluded components:
Amortization approach	0	0
Changes in fair value	436	214
OCI impact
Derivatives - Gains/(losses) recorded in OCI	0	0
Foreign exchange
Gains/(losses) recorded in income
Derivatives	(729)	576
Hedged items	747	(488)
Income statement impact	18	88
Income statement impact of excluded components:
Amortization approach	(78)	(179)
Changes in fair value	18	88
OCI impact
Derivatives - Gains/(losses) recorded in OCI	(37)	115
Commodity
Gains/(losses) recorded in income
Derivatives	(1,261)	1,528
Hedged items	1,288	(1,482)
Income statement impact	27	46
Income statement impact of excluded components:
Amortization approach	0	0
Changes in fair value	12	49
OCI impact
Derivatives - Gains/(losses) recorded in OCI	$ 0	$ 0

Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Amortization Method, Net

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Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Changes in Fair Value, Net

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Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

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Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

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Amount, before tax and adjustments, of gain (loss) from increase (decrease) in value of excluded component of derivative designated and qualifying as hedge. Adjustments include, but are not limited to, reclassifications for sale and settlement, and amounts recognized under systematic and rational method.

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