Pension, Other Postretirement Benefits and Savings Plans (Change in Benefit Obligation and Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Funded Status of Plan	$ (246)	$ (322)
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Loss, Net Prior Service Cost (Credit), before Tax	78	101
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Loss, Net Gains (Losses), before Tax	3,385	2,900
Service cost	39	41	39
Interest cost	261	283	296
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Funded Status of Plan	(2,656)	(2,452)
Gross amount recognized - AOCL	3,463	3,001
Deferred income taxes - AOCL	(125)	(125)
Minority shareholders' equity	(67)	(59)
Net amount recognized	3,271	2,817
Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Loss, Net Prior Service Cost (Credit), before Tax	12	8
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Loss, Net Gains (Losses), before Tax	1,162	844
Service cost	31	32	25
Interest cost	143	150	145
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Funded Status of Plan	(866)	(645)
Gross amount recognized - AOCL	1,174	852
Deferred income taxes - AOCL	(157)	(106)
Minority shareholders' equity	(174)	111
Net amount recognized	843	635
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Loss, Net Prior Service Cost (Credit), before Tax	(246)	(204)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Loss, Net Gains (Losses), before Tax	170	185
Service cost	6	6	5
Interest cost	24	30	33
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Funded Status of Plan	(468)	(576)
Gross amount recognized - AOCL	(76)	(19)
Deferred income taxes - AOCL	4	(6)
Minority shareholders' equity	2	3
Net amount recognized	(70)	(22)
Foreign Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Funded Status of Plan	(222)	(254)
Change in Benefit Obligation [Member] | United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Beginning balance	(5,975)	(5,641)
Newly adopted plans	0	0
Service cost	(39)	(41)
Interest cost	(261)	(283)
Plan amendments	0	0
Actuarial (loss) gain	(863)	(452)
Participant contributions	0	0
Curtailments/Settlements	1	27
Termination benefits	0	0
Divestitures	0	0
Foreign currency translation	0	0
Benefit payments	381	415
Ending balance	(6,756)	(5,975)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Participant contributions	0	0
Benefit payments	381	415
Change in Benefit Obligation [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Beginning balance	(2,736)	(2,696)
Newly adopted plans	(24)	0
Service cost	(31)	(32)
Interest cost	(143)	(150)
Plan amendments	0	0
Actuarial (loss) gain	(383)	(84)
Participant contributions	(3)	(2)
Curtailments/Settlements	39	16
Termination benefits	(1)	(1)
Divestitures	0	5
Foreign currency translation	(88)	53
Benefit payments	150	155
Ending balance	(3,220)	(2,736)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Participant contributions	(3)	(2)
Benefit payments	150	155
Change in Benefit Obligation [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Beginning balance	(582)	(604)
Newly adopted plans	0	0
Service cost	(6)	(6)
Interest cost	(24)	(30)
Plan amendments	82	0
Actuarial (loss) gain	6	(17)
Participant contributions	(31)	(34)
Curtailments/Settlements	0	0
Termination benefits	0	0
Divestitures	0	1
Foreign currency translation	2	15
Benefit payments	79	93
Ending balance	(474)	(582)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Participant contributions	(31)	(34)
Benefit payments	79	93
Change In Plan Assets [Member] | United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Participant contributions	0	0
Benefit payments	(381)	(415)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	3,523	3,714
Actual return on plan assets	497	23
Company contributions to plan assets	454	193
Cash funding of direct participant payments	8	35
Participant contributions	0	0
Settlements	(1)	(27)
Divestitures	0	0
Foreign currency translation	0	0
Benefit payments	(381)	(415)
Ending balance	4,100	3,523
Change In Plan Assets [Member] | Foreign Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Participant contributions	3	2
Benefit payments	(150)	(155)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	2,091	2,074
Actual return on plan assets	158	155
Company contributions to plan assets	193	40
Cash funding of direct participant payments	29	26
Participant contributions	3	2
Settlements	(39)	(15)
Divestitures	0	(1)
Foreign currency translation	69	(35)
Benefit payments	(150)	(155)
Ending balance	2,354	2,091
Change In Plan Assets [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Participant contributions	31	34
Benefit payments	(79)	(93)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	6	7
Actual return on plan assets	0	1
Company contributions to plan assets	2	3
Cash funding of direct participant payments	46	56
Participant contributions	31	34
Settlements	0	0
Divestitures	0	(1)
Foreign currency translation	0	(1)
Benefit payments	(79)	(93)
Ending balance	$ 6	$ 6