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Derivatives And Other Financial Instruments (Schedule Of Carrying Values And Fair Values Of Other Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Short-Term Borrowings [Member]
Derivative [Line Items]
Carrying value	$ 722	$ 62
Fair value	722	62
Commercial Paper [Member]
Derivative [Line Items]
Carrying value	275	224
Fair value	275	224
Long-Term Debt Due Within One Year [Member]
Derivative [Line Items]
Carrying value	128	445
Fair value	128	445
Long-Term Debt, Less Amount Due Within One Year [Member]
Derivative [Line Items]
Carrying value	8,618	8,640
Fair value	9,518	9,274
Cash And Cash Equivalents [Member]
Derivative [Line Items]
Carrying value	1,749	1,939
Fair value	1,749	1,939
Restricted Cash [Member]
Derivative [Line Items]
Carrying value	34	25
Fair value	34	25
Noncurrent Receivables [Member]
Derivative [Line Items]
Carrying value	21	30
Fair value	21	30
Available-For-Sale Securities [Member]
Derivative [Line Items]
Carrying value	84	92
Fair value	$ 84	$ 92

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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