Short-term Borrowings and Current Portion of Long-term Debt Schedule of Short-term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2015	Apr. 09, 2015	Dec. 31, 2014
Short-term Debt [Line Items]
Short-term Debt	$ 1,181		$ 677
Current portion of long-term debt	401		50
Short-term borrowings and current portion of long-term debt	$ 1,582		$ 727
Weighted average interest rate on short-term borrowings outstanding at end of year	2.70%		1.40%
Commercial Paper [Member]
Short-term Debt [Line Items]
Short-term Debt	$ 0		$ 245
Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Short-term Debt	967		0
364-day term loan facility [Member]
Short-term Debt [Line Items]
Short-term Debt	0	$ 175	175
Other short-term bank loans [Member]
Short-term Debt [Line Items]
Short-term Debt	$ 214		$ 257