Pension Savings And Other Postretirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		7 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended			9 Months Ended	3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Frozen United States Pension Plans of US Entity, Defined Benefit [Member]	Feb. 28, 2013 Frozen United States Pension Plans of US Entity, Defined Benefit [Member]	Dec. 31, 2012 Frozen United States Pension Plans of US Entity, Defined Benefit [Member]	Sep. 30, 2013 U.S.	Sep. 30, 2012 U.S.	Sep. 30, 2013 U.S.	Sep. 30, 2012 U.S.	Sep. 30, 2013 Foreign Pension Plans, Defined Benefit	Sep. 30, 2012 Foreign Pension Plans, Defined Benefit	Sep. 30, 2013 Foreign Pension Plans, Defined Benefit	Sep. 30, 2012 Foreign Pension Plans, Defined Benefit	Sep. 30, 2012 Annuity Purhcase to settle U.K. pension plan obligations [Member]	Aug. 31, 2012 Canadian Other Postretirement Benefit Plans, Change in Benefit Obligation [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Aug. 31, 2012 U.S. Other Postretirement Benefit Plans, Change in Benefit Obligation [Member] Other Postretirement Benefit Plans, Defined Benefit [Member]	Sep. 30, 2013 Required Contributions [Member]	Mar. 31, 2013 Required Contributions [Member] Frozen United States Pension Plans of US Entity, Defined Benefit [Member]	Mar. 31, 2013 Discretionary Contributions [Member] Frozen United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost- benefits earned during the period								$ 11	$ 10	$ 34	$ 30	$ 10	$ 8	$ 30	$ 23
Interest cost on projected benefit obligation								61	65	182	196	32	36	97	106
Expected return on plan assets								(84)	(75)	(252)	(225)	(27)	(28)	(83)	(87)
Amortization of prior service cost								4	5	13	17	0	0	1	1
Amortization of net losses								51	45	154	134	7	11	37	34
Net periodic pension cost												22	27	82	77
Curtailments/settlements/termination benefits												2	11	4	11	9
Total defined benefit pension cost								43	50	131	152	24	38	86	88
Pension Savings and Other Postretirement Benefit Plans (Textuals) [Abstract]
Contributions to pension plans								49		967		21		77						34	834
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax						93
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate						3.82%	3.61%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets					4.75%
Defined Benefit Plan, Fair Value of Plan Assets						2,072
Expected Current Year Contributions To Funded Pension Plans, Minimum																			275
Expected Current Year Contributions To Funded Pension Plans, Maximum																			325
Expense recognized for contributions to defined savings plans	34	22	83	72
Postretirement benefit cost (credit)	(3)	0	(7)	3
Defined Benefit Plan, Benefit Obligation																	$ 18	$ 56