Income Taxes Income Taxes- Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance of unrecognized tax benefits	$ 228us-gaap_UnrecognizedTaxBenefits	$ 34us-gaap_UnrecognizedTaxBenefits	$ 28us-gaap_UnrecognizedTaxBenefits
Additions (reductions) related to acquisitions	0	161	0
Additions based on tax positions related to current year	33	38	6
Additions based on tax positions related to prior years	1	5	5
Unrecognized Tax Benefits, Decrease Resulting from Sale of Business	(104)	0	0
Reductions based on tax positions related to prior years	(3)	(1)	(2)
Reductions resulting from statute of limitation lapses	(2)	(3)	(2)
Reductions related to settlements with taxing authorities	(8)	(6)	(1)
Ending balance of unrecognized tax benefits	$ 145us-gaap_UnrecognizedTaxBenefits	$ 228us-gaap_UnrecognizedTaxBenefits	$ 34us-gaap_UnrecognizedTaxBenefits

Unrecognized Tax Benefits, Decrease Resulting from Sale of Business

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Unrecognized Tax Benefits Increases Decreases Resulting From Acquisition.

+ References

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- Definition

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

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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

-Topic 740

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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.

+ References

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15A

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