Retirement Benefits Plans - Changes in Pension and Other Postretirement Liabilities Recognized in AOCI (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
United States pension liabilities [Member]
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss
Balance at January 1	$ 1,142	$ 1,107
Prior service cost arising during the year	1	1
Net loss arising during the year	551	107
Foreign currency translation	0	0
Less amounts included in expense during the year	(92)	(69)
Other	0	(4)
Net change for the year	460	35
Balance at December 31	1,602	1,142
Non-United States pension liabilities [Member]
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss
Balance at January 1	319	263
Prior service cost arising during the year	4	1
Net loss arising during the year	58	60
Foreign currency translation	(5)	(5)
Less amounts included in expense during the year	(18)	(8)
Other	0	8
Net change for the year	39	56
Balance at December 31	358	319
Other postretirement liabilities [Member]
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss
Balance at January 1	221	216
Prior service cost arising during the year	0	0
Net loss arising during the year	39	15
Foreign currency translation	0	0
Less amounts included in expense during the year	(12)	(10)
Other	0	0
Net change for the year	27	5
Balance at December 31	$ 248	$ 221