Consolidated Statement of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Consolidated Statement of Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Change in Net Unrealized Gain Loss on AFS Securities, Net of Reclass and Expected Loss From OTTI, Related Taxes	$ 103	$ 48
Other Comprehensive Income (Loss), Change in Unrealized Gain Loss on AFS Securities Designated as Fair Value Hedges, Related Taxes	21	10
Other Comprehensive Income (Loss), Expected Losses From OTTI on HTM Securities Not From Credit, Related Taxes	1	2
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	49	(23)
Other Comprehensive Income (Loss), Change in Net Unrealized Gains Losses on Cash Flow Hedges, Related Taxes	1	1
Other Comprehensive Income (Loss), Minimum Pension Liability Net Adjustment, Tax	$ 1	$ 4

Tax effect of the adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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The tax effect of the amount of the change in the additional minimum pension liability not yet recognized pursuant to FAS 87 as a net periodic pension cost. If the additional pension liability required to be recognized exceeds the unrecognized prior service costs, then the excess (which is the net loss not yet recognized as net periodic pension cost) is to be recorded as a separate component in other comprehensive income, before adjusting for tax effects. In a subsequent measurement, the elimination or adjustment to the amount of the minimum pension liability recorded in accumulated other comprehensive income is included in this line. Eliminated upon adoption of FAS 158.

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