Other Comprehensive Income, Cumulative OCI Balances (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Cumulative OCI balances [Abstract]
Cumulative other comprehensive income, Translation adjustments, beginning balance	$ 55	$ 130	$ 90	$ 112
Translation adjustments, net change	28	(37)	(7)	(19)
Less: Other comprehensive income (loss) from noncontrolling interests	(1)	(1)	(1)	(1)
Cumulative other comprehensive income, Translation adjustments, ending balance	84	94	84	94
Cumulative other comprehensive income, Securities available for sale, beginning balance	5,939	5,814	4,413	5,066
Securities available for sale, Net change	1,789	(1,532)	3,319	(788)
Less: Other comprehensive income (loss) from noncontrolling interests	3	(5)	7	(9)
Cumulative other comprehensive income, Securities available for sale, ending balance	7,725	4,287	7,725	4,287
Cumulative other comprehensive income, Derivatives and hedging activities, beginning balance	384	629	490	739
Derivatives and hedging activities, Net change	(30)	(46)	(136)	(156)
Less: Other comprehensive income (loss) from noncontrolling interests	0	0	0	0
Cumulative other comprehensive income, Derivatives and hedging activities, ending balance	354	583	354	583
Cumulative other comprehensive income, Defined benefit pension plans, beginning balance	(1,749)	(1,151)	(1,786)	(1,179)
Defined benefit pension plans adjustment, Net change	21	15	58	43
Less: Other comprehensive income (loss) from noncontrolling interests	0	0	0	0
Cumulative other comprehensive income, Defined benefit pension plans, ending balance	(1,728)	(1,136)	(1,728)	(1,136)
Cumulative Other Comprehensive Income (Loss), Net of Tax, Beginning Balance			3,207
Cumulative other comprehensive income, Net change	1,808	(1,600)	3,234	(920)
Cumulative Other Comprehensive Income (Loss), Net of Tax, Ending Balance	6,435		6,435
Cumulative other comprehensive income [Member]
Cumulative OCI balances [Abstract]
Cumulative Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	4,629	5,422	3,207	4,738
Cumulative other comprehensive income, Net change	1,808	(1,600)	3,234	(920)
Less: Other comprehensive income (loss) attributable to noncontrolling interests	2	(6)	6	(10)
Cumulative Other Comprehensive Income (Loss), Net of Tax, Ending Balance	$ 6,435	$ 3,828	$ 6,435	$ 3,828

Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Gross appreciation or the gross loss in value of the total unsold securities, after tax, attributable to noncontrolling interest.

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The increase (decrease) to accumulated comprehensive income during the period related to benefit plans, after tax, attributable to noncontrolling interest.

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Net of tax effect change in accumulated gains (losses) from derivative instruments designated and qualifying as the effective portion of cash flow hedges, attributable to noncontrolling interest. The change includes an entity's share of an equity investee's increase (decrease) in deferred hedging gains or losses.

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Adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into functional currency of the reporting entity, net of tax, attributable to noncontrolling interest.

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This element represents Other Comprehensive Income or Loss, Net of Tax, for the period attributable to noncontrolling interest. Includes deferred gains or losses on qualifying hedges, unrealized holding gains or losses on available-for-sale securities, minimum pension liability, and cumulative translation adjustment.

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Net of tax amount of the appreciation (loss) in the value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) losses.

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

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Net of tax and reclassification adjustments of the change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity. Also includes the following: gain (loss) on foreign currency forward exchange contracts; foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; and gain (loss) on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain (loss) that has been designated and qualified as a hedging instrument for hedging of the foreign currency exposure of a net investment in a foreign operation.

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Net of tax amount of other comprehensive income (loss) attributable to both parent entity and noncontrolling interest.

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Net of tax and reclassifications amount of pension and other postretirement benefit plans (gain) loss included in accumulated other comprehensive income (loss).

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