Benefit Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 plan	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, number of plans	1
Defined contribution plan, award vesting period	5 years
Defined contribution plan contributions	$ 15	$ 21	$ 22
Defined benefit plan, number of plans disclosure	30
U.S. Defined Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, number of plans disclosure	5