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Derivatives And Other Financial Instruments (Carrying Values And Fair Values Of Other Financial Instruments) (Details) (USD $) In Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Cash And Cash Equivalents [Member]
Carrying value	$ 1,260	$ 1,543
Fair value	1,260	1,543
Restricted Cash [Member]
Carrying value	1	1
Fair value	1	1
Noncurrent Receivables [Member]
Carrying value	26	23
Fair value	26	23
Available-For-Sale Securities [Member]
Carrying value	95	93
Fair value	95	93
Short-Term Borrowings [Member]
Carrying value	65	92
Fair value	65	92
Long-Term Debt Due Within One Year [Member]
Carrying value	510	231
Fair value	510	231
Long-Term Debt, Less Amount Due In One Year [Member]
Carrying value	8,773	8,842
Fair value	$ 10,012	$ 9,882

The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

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