Marketable Securities (Investments In Debt And Equity Securities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 1,011	$ 942
Available-for-sale securities, gross unrealized gain accumulated in investment	1	1
Available-for-sale securities, gross unrealized loss accumulated in investment	(12)	(2)
Fair Value	1,000us-gaap_AvailableForSaleSecurities	941us-gaap_AvailableForSaleSecurities
United States Government Obligations [Member] \| Maturity Less Than 1 Year [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	385	395
Available-for-sale securities, gross unrealized gain accumulated in investment	0	0
Available-for-sale securities, gross unrealized loss accumulated in investment	0	0
Available-for-sale Securities, Debt Securities	385	395
United States Government Obligations [Member] \| Maturity Period After Within One Year [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	93	124
Available-for-sale securities, gross unrealized gain accumulated in investment	0	0
Available-for-sale securities, gross unrealized loss accumulated in investment	0	0
Available-for-sale Securities, Debt Securities	93	124
Government-Sponsored Enterprise Obligations [Member] \| Maturity Period After Within One Year [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis		4
Available-for-sale securities, gross unrealized gain accumulated in investment		0
Available-for-sale securities, gross unrealized loss accumulated in investment		0
Available-for-sale Securities, Debt Securities		4
Corporate Debt Securities [Member] \| Maturity Period After Within One Year [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	72	16
Available-for-sale securities, gross unrealized gain accumulated in investment	0	0
Available-for-sale securities, gross unrealized loss accumulated in investment	0	0
Available-for-sale Securities, Debt Securities	72	16
Other Debt Instruments [Member] \| Maturity Less Than 1 Year [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	130	38
Available-for-sale securities, gross unrealized gain accumulated in investment	0	0
Available-for-sale securities, gross unrealized loss accumulated in investment	0	0
Available-for-sale Securities, Debt Securities	130	38
Other Debt Instruments [Member] \| Maturity Period After Within One Year [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	3	3
Available-for-sale securities, gross unrealized gain accumulated in investment	0	0
Available-for-sale securities, gross unrealized loss accumulated in investment	0	0
Available-for-sale Securities, Debt Securities	3	3
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Equity Securities	317	361
Available-for-sale securities, gross unrealized gain accumulated in investment	1	1
Available-for-sale securities, gross unrealized loss accumulated in investment	(12)	(2)
Available-for-sale Equity Securities, Amortized Cost Basis	$ 328	$ 362

The increase in investment due to gross unrealized gain accumulated in AOCI.

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