Fair Value of Financial Instruments Fair Value of Financial Instruments (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Benefit Plan, Transfers Between Measurement Levels	$ 0	$ 0
Cash Surrender Value, Fair Value Disclosure	25,000,000		26,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0	0
Long-term Debt, Fair Value	2,186,000,000		2,074,000,000
Long-term Debt	$ 1,916,000,000		$ 1,916,000,000