Other Income and Expense (Other Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Income and Expenses [Abstract]
Loss on sale and disposal of assets	$ 48	$ 47	$ 51
Legal settlement	9	11	9
Contract termination	0	0	7
Other	8	10	9
Total other expense	$ 65	$ 68	$ 76