Fair Value (Transfers between Levels of the Fair Value Hierarchy) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Fair Value Transfers Between Level 1, Level 2 and Level 3 [Line Items]
Fair Value Transfer from Level 1 to Level 2, Amount	$ 0	$ 0
Fair Value Transfer from Level 1 to Level 3, Amount	0	0
Fair Value Transfer from Level 2 to Level 1, Amount	0	0
Fair Value Transfer from Level 2 to Level 3, Amount	1	1
Fair Value Transfer from Level 3 to Level 1, Amount	0	0
Fair Value Transfer from Level 3 to Level 2, Amount	$ 0	$ 0