Changes in Accumulated Other Comprehensive (Loss) Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Changes in Other Comprehensive income
Balances as of January 1	$ (927)
Net unrealized pension and other postretirement benefit gains, net of tax	27	6
Balances as of March 31	(980)
Accumulated Other Comprehensive (Loss) Income [Member]
Changes in Other Comprehensive income
Balances as of January 1	(927)	(876)
Net unrealized gains (losses)	(12)	34
Reclassification for realized (gains) losses into earnings	(23)	(13)
Net translation of investments in foreign operations	11	322
Net gains (losses) related to hedges of investment in foreign operations	(56)	(250)
Net unrealized pension and other postretirement benefit gains, net of tax	27	6
Net change in accumulated other comprehensive (loss) income	(53)	99
Balances as of March 31	(980)	(777)
Net Unrealized Investment Gains (Losses) on Investment Securities [Member]
Changes in Other Comprehensive income
Balances as of January 1	315	288
Net unrealized gains (losses)	(12)	34
Reclassification for realized (gains) losses into earnings	(23)	(14)
Net change in accumulated other comprehensive (loss) income	(35)	20
Balances as of March 31	280	308
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Changes in Other Comprehensive income
Balances as of January 1	0	(1)
Reclassification for realized (gains) losses into earnings		1
Net change in accumulated other comprehensive (loss) income	0	1
Balances as of March 31	0	0
Foreign Currency Translation Adjustments [Member]
Changes in Other Comprehensive income
Balances as of January 1	(754)	(682)
Net translation of investments in foreign operations	11	322
Net gains (losses) related to hedges of investment in foreign operations	(56)	(250)
Net change in accumulated other comprehensive (loss) income	(45)	72
Balances as of March 31	(799)	(610)
Net Unrealized Pension and Other Postretirement Benefit Losses [Member]
Changes in Other Comprehensive income
Balances as of January 1	(488)	(481)
Net unrealized pension and other postretirement benefit gains, net of tax	27	6
Net change in accumulated other comprehensive (loss) income	27	6
Balances as of March 31	$ (461)	$ (475)

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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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Publisher SEC

-Name Regulation S-X (SX)

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-Publisher AICPA

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+ Details

- Definition

Net of tax and reclassification adjustments amount of the increase (decrease) in accumulated other comprehensive income (loss) related to pension and other postretirement benefit plans, attributable to the parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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+ Details