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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Tax Contingency [Line Items]        
Effective Income Tax Rate 49.60% 33.00% 32.00% 21.30%
Income Tax Reconciliation, Tax Planning Initiatives $ 7      
Document Fiscal Year Focus     2013  
Tax Benefit From Sale Of Non U S Leverage Lease       17
Tax benefit related to foreign tax       22
Effective Income Tax Rate Reconciliation, Other Adjustments 4      
Income Tax Reconciliation, Change in Enacted Tax Rate $ 4