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Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 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	1	2	2	2
Derivatives instruments designated and qualifying as cash flow hedges, tax effect
Tax (expense) benefit on gain (loss) arising during the year	(7)	0	(7)	1
Tax expense (benefit) on (gain) loss reclassified into income	$ 0	$ 13	$ 0	$ 47

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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