Statement of Comprehensive Income (Parenthetical) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Other Comprehensive Income (Loss):
Tax on foreign currency translation	$ 0	$ 0	$ 0	$ 1
Defined benefit plans:
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost	0	14	2	19
Tax on net actuarial losses	0	1	1	1
Tax on immediate recognition of prior service cost and unrecognized gains and losses due to curtailments and settlements	0	0	1	0
Tax on deferred derivative loss	0	0	0	0
Tax on reclassification adjustment for amounts recognized in income	0	0	0	0
Tax on unrealized investment gains	$ 0	$ 0	$ 0	$ 0