Financial Instruments and Fair Value Measures (Details 6) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Assets
Investments	$ 96	$ 145
Total assets	96	145
Liabilities
Short-term borrowings	760	425
Current portion of long-term debt and lease obligations	24	4,026
Long-term debt and lease obligations, excluding fair value hedges	31,023	10,803
Total liabilities	31,807	15,254
Quoted prices in active markets for identical assets (Level 1)
Assets
Investments	51	68
Total assets	51	68
Liabilities
Current portion of long-term debt and lease obligations		4,005
Long-term debt and lease obligations, excluding fair value hedges	30,929	10,710
Total liabilities	30,929	14,715
Significant other observable inputs (Level 2)
Assets
Investments	17	13
Total assets	17	13
Liabilities
Short-term borrowings	760	425
Current portion of long-term debt and lease obligations	24	21
Long-term debt and lease obligations, excluding fair value hedges	94	93
Total liabilities	878	539
Significant unobservable inputs (Level 3)
Assets
Investments	28	64
Total assets	$ 28	$ 64