Financial Instruments and Fair Value Measures (Details 5) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Assets
Investments	$ 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
Book values
Assets
Investments	58	95
Liabilities
Short-term borrowings	760	425
Current portion of long-term debt and lease obligations	8	4,014
Long-term debt and lease obligations, excluding fair value hedges	31,303	10,718
Fair value
Assets
Investments	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