Financial Instruments and Fair Value Measures (Details 5) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Assets
Investments	$ 37	$ 145
Liabilities
Short-term borrowings	406	425
Current portion of long-term debt and lease obligations	2,016	4,026
Long-term debt and lease obligations, excluding fair value hedges	29,143	10,803
Carrying Reported Amount Fair Value Disclosure
Assets
Investments	34	95
Liabilities
Short-term borrowings	406	425
Current portion of long-term debt and lease obligations	2,025	4,014
Long-term debt and lease obligations, excluding fair value hedges	29,312	10,718
Estimate Of Fair Value Fair Value Disclosure
Assets
Investments	37	145
Liabilities
Short-term borrowings	406	425
Current portion of long-term debt and lease obligations	2,016	4,026
Long-term debt and lease obligations, excluding fair value hedges	$ 29,143	$ 10,803