Benefit Plans (Net Postemployment Costs) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 1	$ 1	$ 1
Interest cost	1	1	2
Amortization of net loss	18	17	16
Other	(17)	(7)	121
Net postemployment costs	$ 3	$ 12	$ 140