Equity, Changes in Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Changes in Accumulated Other Comprehensive Income (Loss), By Component
Beginning balance, accumulated other comprehensive income (loss), net of tax	$ (367)
Other comprehensive loss	(363)	(73)
Ending balance, accumulated other comprehensive income (loss), net of tax	(730)
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Accumulated Other Comprehensive Income (Loss), By Component
Beginning balance, accumulated other comprehensive income (loss), net of tax	(367)	350
Other comprehensive income (loss) before reclassifications	(366)	(69)
Amounts reclassified from accumulated other comprehensive income (loss)	3	(4)
Other comprehensive loss	(363)	(73)
Ending balance, accumulated other comprehensive income (loss), net of tax	(730)	277
Foreign Currency Translation Adjustment [Member]
Changes in Accumulated Other Comprehensive Income (Loss), By Component
Beginning balance, accumulated other comprehensive income (loss), net of tax	1	408
Other comprehensive income (loss) before reclassifications	(366)	(74)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0
Other comprehensive loss	(366)	(74)
Ending balance, accumulated other comprehensive income (loss), net of tax	(365)	334
Accumulated Defined Benefit Plans Adjustment [Member]
Changes in Accumulated Other Comprehensive Income (Loss), By Component
Beginning balance, accumulated other comprehensive income (loss), net of tax	(368)	(58)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	3	(2)
Other comprehensive loss	3	(2)
Ending balance, accumulated other comprehensive income (loss), net of tax	(365)	(60)
Gains and (Losses) on Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income (Loss), By Component
Beginning balance, accumulated other comprehensive income (loss), net of tax	0	0
Other comprehensive income (loss) before reclassifications	0	5
Amounts reclassified from accumulated other comprehensive income (loss)	0	(2)
Other comprehensive loss	0	3
Ending balance, accumulated other comprehensive income (loss), net of tax	$ 0	$ 3

- Definition

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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