Income Taxes (Changes in Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes In Unrecognized Tax Benefits
Beginning Balance	$ 644us-gaap_UnrecognizedTaxBenefits	$ 297us-gaap_UnrecognizedTaxBenefits	$ 301us-gaap_UnrecognizedTaxBenefits
Additions based on tax positions related to current year	1	18	14
Additions (reductions) for tax positions of prior years	(34)	343	0
Settlements	(17)	0	(5)
Unrecognized deferred tax benefits from business acquisitions	(91)	(14)	(13)
Ending Balance	503us-gaap_UnrecognizedTaxBenefits	644us-gaap_UnrecognizedTaxBenefits	297us-gaap_UnrecognizedTaxBenefits
Federal
Unrecognized Tax Benefits That Would Have Impacted Effective Rate [Line Items]
Unrecognized tax benefit that would impact effective tax rate	497	631	288
State
Unrecognized Tax Benefits That Would Have Impacted Effective Rate [Line Items]
Unrecognized tax benefit that would impact effective tax rate	$ 4	$ 11	$ 9

Unrecognized Tax Benefits Increases Resulting From Tax Positions From Business Combinations

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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

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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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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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