Pension and Other Postretirement Employee Benefit Plans - Pretax Pension and OPEB in AOCI (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Pension Plans [Member]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax
Defined Benefit Plan Percen Above Which Amortization Of Net Gains And Losses Is Included In Annual Net Periodic Benefit Cost	10.00%
Defined Benefit Pension Plans, U.S. [Member]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax
Net gain/(loss)	$ (3,669)	$ (2,627)
Prior service credit/(cost)	278	321
Accumulated other comprehensive income/(loss), pretax, end of year	(3,391)	(2,306)
Defined Benefit Pension Plans, Non-U.S. [Member]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax
Net gain/(loss)	(544)	(566)
Prior service credit/(cost)	12	13
Accumulated other comprehensive income/(loss), pretax, end of year	(532)	(553)
OPEB Plans [Member]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax
Net gain/(loss)	(176)	(119)
Prior service credit/(cost)	1	9
Accumulated other comprehensive income/(loss), pretax, end of year	$ (175)	$ (110)
Defined Benefit Plan Percen Above Which Amortization Of Net Gains And Losses Is Included In Annual Net Periodic Benefit Cost	10.00%