Income Taxes (Unrecognized Tax Benefits, Including Those Attributable To Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Income Tax Expense (Benefit) [Rollforward]
Balance at January 1	$ 147us-gaap_UnrecognizedTaxBenefits	$ 157us-gaap_UnrecognizedTaxBenefits
Additions based on tax positions related to current year	4	13
Additions for tax positions of prior years	21	70
Reductions for tax positions of prior years	(55)	(10)
Settlements and agreements	(19)	(82)
Lapse of statute of limitations	(2)	(1)
Balance at December 31	$ 96us-gaap_UnrecognizedTaxBenefits	$ 147us-gaap_UnrecognizedTaxBenefits

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

+ References

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-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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