Other Income and Expense - Other Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Other Income and Expenses [Abstract]
Loss on sale and disposal of assets	$ 12	$ 12	$ 31	$ 36
Contract termination	0	0	0	7
Other	0	3	6	15
Total other expense	$ 12	$ 15	$ 37	$ 58