Income Taxes (Schedule of Unrecognized Tax Benefits Rollforward) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Balance at January 1	$ (161)us-gaap_UnrecognizedTaxBenefits	$ (972)us-gaap_UnrecognizedTaxBenefits	$ (857)us-gaap_UnrecognizedTaxBenefits
(Additions) reductions based on tax positions related to current year	(15)	(22)	12
Additions for tax positions of prior years	(1)	(29)	(140)
Reductions for tax positions of prior years	9	824	6
Settlements	0	26	2
Expiration of statutes of limitations	2	11	7
Currency translation adjustment	8	1	(2)
Balance at December 31	$ (158)us-gaap_UnrecognizedTaxBenefits	$ (161)us-gaap_UnrecognizedTaxBenefits	$ (972)us-gaap_UnrecognizedTaxBenefits

Unrecognized Tax Benefits, Increases Decreases Resulting From Currency Translation

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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