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Fair Value Measurements (Non-Recurring Fair Value Measurements) (Details) - Non-recurring - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Adjustments To Assets Measured At Fair Value On Non Recurring Basis $ (112) $ (189) $ (4,037) $ (403)  
Financing receivables and loans held for sale [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Adjustments To Assets Measured At Fair Value On Non Recurring Basis (27) (89) (2,447) (117)  
Cost and equity method investments [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Adjustments To Assets Measured At Fair Value On Non Recurring Basis (60) (42) (1,509) (203)  
Long Lived Assets, Including Real Estate [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Adjustments To Assets Measured At Fair Value On Non Recurring Basis (25) $ (58) (81) $ (83)  
Level 2          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Cost and equity method investments 0   0   $ 0
Long-lived assets, including real-estate     0   102
Financing receivables and loans held for sale     0   1
Assets Fair Value Disclosure 0   0   103
Level 3          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Cost and equity method investments 2,123   2,123   346
Long-lived assets, including real-estate     159   718
Financing receivables and loans held for sale     22,532   584
Assets Fair Value Disclosure $ 24,814   $ 24,814   $ 1,648