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Long-Term Debt And Capital Lease Obligation (Book Value And Principal Amounts Of Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument
Book value	$ 791us-gaap_LongTermDebt	$ 790us-gaap_LongTermDebt
Principal amount	793us-gaap_DebtInstrumentFaceAmount	793us-gaap_DebtInstrumentFaceAmount
6.900% Senior Debentures, Due 2028
Debt Instrument
Interest rate	6.90%	6.90%
Debt issuance year	1998
Book value	28	28
Principal amount	28	28
6.920% Senior Debentures, Due 2028
Debt Instrument
Interest rate	6.92%	6.92%
Debt issuance year	2005
Book value	391	391
Principal amount	391	391
6.125% Senior Notes, Due 2034
Debt Instrument
Interest rate	6.125%	6.125%
Debt issuance year	2004
Book value	372	371
Principal amount	$ 374	$ 374

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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