Short-term Borrowings and Other Debt Obligations Schedule of Short-term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Short-term Debt [Line Items]
Short-term Debt	$ 2	$ 1,181
Current portion of long-term debt	177	401
Short-term borrowings and current portion of long-term debt	$ 179	$ 1,582
Weighted average interest rate on short-term borrowings outstanding at end of year	0.70%	2.70%
Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Short-term Debt	$ 0	$ 967
Other short-term bank loans [Member]
Short-term Debt [Line Items]
Short-term Debt	$ 2	$ 214