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Fair Value Measurements (Non-Recurring Fair Value Measurements) (Details) - Non-recurring - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Adjustments To Assets Measured At Fair Value On Non Recurring Basis $ (197) $ (72)
Financing receivables and loans held for sale    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Adjustments To Assets Measured At Fair Value On Non Recurring Basis (23) (4)
Cost and equity method investments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Adjustments To Assets Measured At Fair Value On Non Recurring Basis (115) (31)
Long Lived Assets, Including Real Estate    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Adjustments To Assets Measured At Fair Value On Non Recurring Basis (58) (38)
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financing receivables and loans held for sale 0 0
Cost and equity method investments 0 1
Long-lived assets 0 2
Assets Fair Value Disclosure 0 3
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financing receivables and loans held for sale 119 154
Cost and equity method investments 375 436
Long-lived assets 62 882
Assets Fair Value Disclosure $ 555 $ 1,471