Commitments and Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies [Line Items]
Guarantor Obligations, Current Carrying Value	$ 4
Outstanding claims related to guarantees	0
Royalty Expense	27	22	22
LTSA [Member]
Unrecorded Unconditional Purchase Obligation
Unrecorded Unconditional Purchase Obligation	134
Term of Unrecorded Unconditional Purchase Obligation Lower Limit	P1Y
Term of Unrecorded Unconditional Purchase Obligation Upper Limit	P12Y
Electric Generation Equipment [Member]
Commitments and Contingencies [Line Items]
Operating Leases, Rent Expense, Net	47	51	53
Office Equipment [Member]
Commitments and Contingencies [Line Items]
Operating Leases, Rent Expense, Net	$ 12	$ 12	$ 13