Income Taxes (Schedule of Unrecognized tax benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Balance, January 1	$ 113us-gaap_UnrecognizedTaxBenefits	$ 178us-gaap_UnrecognizedTaxBenefits	$ 178us-gaap_UnrecognizedTaxBenefits
Additions for tax positions of the current year	17	17	13
Additions for tax positions of prior years	4	6	16
Reductions for tax positions of prior years	(23)	(81)	(15)
Settlements during the period	(11)	(3)	(5)
Positions assumed in acquisitions	42	0	0
Lapses of applicable statute of limitation	1	4	9
Balance, December 31	$ 141us-gaap_UnrecognizedTaxBenefits	$ 113us-gaap_UnrecognizedTaxBenefits	$ 178us-gaap_UnrecognizedTaxBenefits

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854

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-Name Accounting Standards Codification

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

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of increase in unrecognized tax benefits resulting from acquisitions.

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

-Publisher FASB

-Name Accounting Standards Codification

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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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-Name Accounting Standards Codification

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UnrecognizedTaxBenefitsReductionsResultingFromChangesInJudgment

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