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Income Taxes Income Taxes (Details) (USD $)	12 Months Ended
Income Taxes Income Taxes (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Loss Carryforwards [Line Items]
Undistributed Earnings of Foreign Subsidiaries	$ 2,000,000,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	106,000,000	193,000,000
Deferred Tax Assets, Valuation Allowance	75,000,000	95,000,000	11,000,000	16,000,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound	17,000,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	61,000,000
Unrecognized Tax Benefits	145,000,000us-gaap_UnrecognizedTaxBenefits	228,000,000us-gaap_UnrecognizedTaxBenefits	34,000,000us-gaap_UnrecognizedTaxBenefits	28,000,000us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits, Interest on Income Taxes Expense	4,000,000	3,000,000	2,000,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	45,000,000	39,000,000
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	126,000,000	109,000,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	611,000,000	775,000,000
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	77,000,000	152,000,000
Other Noncurrent Liabilities [Member]
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits	129,000,000
Other Current Liabilities [Member]
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits	$ 16,000,000