Other Comprehensive Income (Parenthetical) (Details) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Other Comprehensive Income
Unrealized net gain (loss) on derivative hedging instruments, tax (benefit)	$ (5)	$ (7)	$ (4)	$ 11
Reclassification adjustments for derivative (gain) included in net income, tax	(4)	3	(2)	12
Pension and other postretirement activity, tax (benefit)	$ (1)	$ 5	$ (2)	$ 6

Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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Tax effect on reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period.

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- Definition

Tax effect on the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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