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Derivatives (Classification Of Gross Fair Values Of Derivative Instruments, Excluding Cash Collateral) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Commodity Derivatives [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Asset	$ 99	$ 26
Liability	75	45
Commodity Derivatives [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Asset		1
Liability		1
Interest Rate Derivatives [Member] \| Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset		$ 19

Fair value of liability associated with derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details

- Definition

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details