Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended
Dec. 31, 2013	Mar. 31, 2013	Mar. 31, 2014 Net Effect of Exchange Rate Fluctuations	Mar. 31, 2013 Net Effect of Exchange Rate Fluctuations	Mar. 31, 2014 Change in Certain Derivative Instruments	Mar. 31, 2013 Change in Certain Derivative Instruments	Mar. 31, 2014 Employee Benefit Plans	Mar. 31, 2013 Employee Benefit Plans	Mar. 31, 2014 Accumulated Other Comprehensive Loss	Mar. 31, 2013 Accumulated Other Comprehensive Loss
Increase (Decrease) Accumulated Other Comprehensive Loss, Net of Tax
Balance at beginning of the period	$ (1,121)	$ (1,485)	$ 229	$ 455	$ (12)	$ (14)	$ (1,338)	$ (1,947)	$ (1,121)	$ (1,506)
Change before reclassifications			35	(28)	2	3			37	(25)
Amounts reclassified from accumulated other comprehensive income					(1)	1	23	37	22	38
Translation effect							1	10	1	10
Tax effect							(1)	(2)	(1)	(2)
Other comprehensive income attributable to the Company			35	(28)	1	4	23	45	59	21
Balance at end of the period	$ (1,121)	$ (1,485)	$ 264	$ 427	$ (11)	$ (10)	$ (1,315)	$ (1,902)	$ (1,062)	$ (1,485)

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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Amount before 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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