CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Change in net actuarial loss, tax	$ (3)	$ (1)
Auction rate securities marked to market, tax	$ (2)

Tax effect of unrealized holding gain (loss) at the date of the transfer for a debt security from the held-to-maturity category transferred into the available-for-sale category. Also includes the tax effect of unrealized gain (loss) at the date of transfer for a debt security from the available-for-sale category transferred into the held-to-maturity category.

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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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