Other Income and Expense - Other Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Other Income and Expenses [Abstract]
Loss on sale and disposal of assets	$ 12	$ 10	$ 19	$ 25
Contract termination	0	0	0	7
Other	5	7	6	11
Total other expense	$ 17	$ 17	$ 25	$ 43