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, 2013	Dec. 31, 2012	Dec. 31, 2011
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss
Prior service cost arising during the year	$ (6)	$ (1)	$ (5)
Less amounts included in expense during the year	456	(386)	(648)
Net change for the year	2	(2)	0
United States pension liabilities [Member]
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss
Balance at January 1	1,621	1,602
Prior service cost arising during the year	2	1
Net loss arising during the year	381	(154)
Foreign currency translation	0	0
Less amounts included in expense during the year	(186)	(138)
Other	(2)	(2)
Net change for the year	(567)	19
Balance at December 31	1,054	1,621
Non-United States pension liabilities [Member]
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss
Balance at January 1	559	358
Prior service cost arising during the year	4	0
Net loss arising during the year	12	(205)
Foreign currency translation	6	15
Less amounts included in expense during the year	(29)	(19)
Other	0	0
Net change for the year	(31)	201
Balance at December 31	528	559
Other postretirement liabilities [Member]
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss
Balance at January 1	262	248
Prior service cost arising during the year	0	0
Net loss arising during the year	63	(27)
Foreign currency translation	1	0
Less amounts included in expense during the year	(14)	(13)
Other	0	0
Net change for the year	(78)	14
Balance at December 31	$ 184	$ 262