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Financial Instruments and Fair Value Measures (Details 6) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Fair value    
Assets    
Investments $ 151 $ 145
Total assets 151 145
Liabilities    
Short-term borrowings   425
Current portion of long-term debt and lease obligations 4,010 4,026
Long-term debt and lease obligations, excluding fair value hedges 27,017 10,803
Total liabilities 31,027 15,254
Quoted prices in active markets for identical assets (Level 1)    
Assets    
Investments 64 68
Total assets 64 68
Liabilities    
Current portion of long-term debt and lease obligations 3,987 4,005
Long-term debt and lease obligations, excluding fair value hedges 26,924 10,710
Total liabilities 30,911 14,715
Significant other observable inputs (Level 2)    
Assets    
Investments 18 13
Total assets 18 13
Liabilities    
Short-term borrowings   425
Current portion of long-term debt and lease obligations 23 21
Long-term debt and lease obligations, excluding fair value hedges 93 93
Total liabilities 116 539
Significant unobservable inputs (Level 3)    
Assets    
Investments 69 64
Total assets $ 69 $ 64