Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Pension and other postretirement benefits, tax effect
Tax (expense) benefit on gain (loss) arising during the year	$ 0	$ 0	$ 0	$ 0
Tax (expense) benefit on gain (loss) arising during the year	0	0	1	0
Derivatives instruments designated and qualifying as cash flow hedges, tax effect
Tax (expense) benefit on gain (loss) arising during the year	0	0	0	1
Tax expense (benefit) on (gain) loss reclassified into income	$ 0	$ 17	$ 0	$ 34

Tax effect on the accumulated change in the value of either the projected benefit obligation or plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost.

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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

For each annual statement of income presented, the tax effect of the net gain (loss) recognized in other comprehensive income that is a reclassification adjustment of other comprehensive income as a result of being recognized as a component of net periodic benefit cost for 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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