Debt with Affiliated Companies (Details) - Affiliated Entity [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Other short-term debt	$ 88	$ 13
Notes payable within one year	13	307
Notes payable after one year	83	5
Debt with affiliated companies	184	325
Interest Expense, Related Party	$ 19	$ 25	$ 22