Consolidated Statements Of Stockholders' Equity (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net unrealized gain (loss) on securities, tax	$ 1	$ (1)	$ (34)
Foreign currency translation adjustments, tax	(4)	(8)	46
Amortization of retirement benefits adjustments, tax	99	73	57
Mid-year remeasurement of retirement benefits, tax	52	9	(13)
Year-end adjustments of other retirement benefits, tax	(419)	(332)	(14)
Net gain on derivative hedging instruments, tax	(1)	0	(1)
Accumulated Other Comprehensive Income (Loss), Net of Tax
Net unrealized gain (loss) on securities, tax	1	(1)	(34)
Foreign currency translation adjustments, tax	(4)	(8)	46
Amortization of retirement benefits adjustments, tax	99	73	57
Mid-year remeasurement of retirement benefits, tax	52	9	(13)
Other Comprehensive Income Pension Plan Amendment Tax			0
Year-end adjustments of other retirement benefits, tax	(419)	(332)	(14)
Net gain on derivative hedging instruments, tax	$ (1)	$ 0	$ (1)