Benefit Plans (Termination, Settlement and Curtailment Changes for Pension Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Net loss		$ 7	$ 21
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation		1	0
Net loss		6	21
Termination and settlement	$ 0	$ 7	$ 21