Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 8,316	$ 7,029	$ 17,028	$ 13,477
Other comprehensive income/(loss), after–tax
Unrealized gains/(losses) on investment securities	(227)	457	(1,461)	695
Translation adjustments, net of hedges	88	0	115	7
Fair value hedges	(68)		(108)
Cash flow hedges	(166)	53	(239)	144
Defined benefit pension and OPEB plans	38	19	59	4
DVA on fair value option elected liabilities	260	2	527	(67)
Total other comprehensive income/(loss), after–tax	(75)	531	(1,107)	783
Comprehensive income	$ 8,241	$ 7,560	$ 15,921	$ 14,260

Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent

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Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments and Tax, Parent

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan, attributable to parent.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

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Amount, after tax and reclassification adjustment, of gain (loss) from increase (decrease) in instrument-specific credit risk of financial liability measured under fair value option, attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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