Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 21,762us-gaap_NetIncomeLoss	$ 17,923us-gaap_NetIncomeLoss	$ 21,284us-gaap_NetIncomeLoss
Other comprehensive income/(loss), after–tax
Unrealized gains/(losses) on investment securities	1,975	(4,070)	3,303
Translation adjustments, net of hedges	(11)	(41)	(69)
Cash flow hedges	44	(259)	69
Defined benefit pension and OPEB plans	(1,018)	1,467	(145)
Total other comprehensive income/(loss), after–tax	990	(2,903)	3,158
Comprehensive income	$ 22,752us-gaap_ComprehensiveIncomeNetOfTax	$ 15,020us-gaap_ComprehensiveIncomeNetOfTax	$ 24,442us-gaap_ComprehensiveIncomeNetOfTax

The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period.

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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 increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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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.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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