Income Taxes (Changes in Liability for Unrecognized Tax Benefits) (Details) - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Beginning balance of gross unrecognized tax benefits	$ 77,000,000	$ 110,000,000	$ 176,000,000
Increases: Positions taken during a prior period	17,000,000		11,000,000
Decreases: Positions taken during a prior period	(9,000,000)	(27,000,000)	(22,000,000)
Decreases: Settlements with taxing authorities	(52,000,000)	(1,000,000)	(48,000,000)
Decreases: Reductions resulting from lapse of statute of limitations	(7,000,000)	(5,000,000)	(7,000,000)
Ending balance of gross unrecognized tax benefits	$ 26,000,000	$ 77,000,000	$ 110,000,000

Income Taxes

No definition available.

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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
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

Reference 2: 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

+ Details

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- Definition

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

+ References

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- Definition

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

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- Definition

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

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- Definition

Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

+ References

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