Derivative Instruments - Impact on Statements of Income, Fair Value Hedges (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Gains/(losses) recorded in income
Derivatives	$ 886	$ (1,149)
Hedged items	(590)	1,449
Income statement impact	296	300
Income statement impact of excluded components:
Amortization approach	(222)	(122)
Changes in fair value	292	276
OCI impact
Derivatives - Gains/(losses) recorded in OCI	3	(52)
Interest rate
Gains/(losses) recorded in income
Derivatives	1,464	(1,477)
Hedged items	(1,293)	1,629
Income statement impact	171	152
Income statement impact of excluded components:
Amortization approach	0	0
Changes in fair value	172	147
OCI impact
Derivatives - Gains/(losses) recorded in OCI	0	0
Foreign exchange
Gains/(losses) recorded in income
Derivatives	(290)	144
Hedged items	409	(33)
Income statement impact	119	111
Income statement impact of excluded components:
Amortization approach	(222)	(122)
Changes in fair value	119	111
OCI impact
Derivatives - Gains/(losses) recorded in OCI	3	(52)
Commodity
Gains/(losses) recorded in income
Derivatives	(288)	184
Hedged items	294	(147)
Income statement impact	6	37
Income statement impact of excluded components:
Amortization approach	0	0
Changes in fair value	1	18
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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