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Acquisitions and Divestitures (Key components of income from discontinued operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Components of income from discontinued operations
Revenue		$ 40us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Expenses		29us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense
Operating income		11us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss
Provision for taxes on income		4us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod
Income from discontinued operations, net of tax	$ 0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	$ 7us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax

X

- Definition

Amount after tax of income (loss) from operations classified as a discontinued operation. Excludes gain (loss) on disposal and provision for gain (loss) until disposal.

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Amount of tax expense (benefit) attributable to income (loss) from operations classified as a discontinued operation. Excludes tax expense (benefit) for gain (loss) on disposal and for provision for gain (loss) until disposal.

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Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation.

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