Pension and Other Postretirement Employee Benefit Plans (Details) (Textuals) (USD $)	Mar. 31, 2012	Dec. 31, 2011
U.S. Defined Benefit Pension And OPEB Plans [Member]
Pension and other postretirement employee benefit plans (Numeric) [Abstract]
Defined Benefit Plan, Fair Value of Plan Assets	$ 14,400,000,000	$ 11,900,000,000
Defined Benefit Pension Plans, U.S. [Member]
Pension and other postretirement employee benefit plans (Numeric) [Abstract]
Defined benefit pension plan, non-U.S., expected contribution, 2010	0
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	0
Other Pension Plans, Defined Benefit [Member]
Pension and other postretirement employee benefit plans (Numeric) [Abstract]
Defined benefit pension plan, non-U.S., expected contribution, 2010	39,000,000
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	39,000,000
Defined Benefit Pension Plans, Non-U.S. [Member]
Pension and other postretirement employee benefit plans (Numeric) [Abstract]
Defined benefit pension plan, non-U.S., expected contribution, 2010	49,000,000
Defined Benefit Plan, Fair Value of Plan Assets	3,100,000,000	3,000,000,000
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	49,000,000
OPEB Plans [Member]
Pension and other postretirement employee benefit plans (Numeric) [Abstract]
Defined benefit pension plan, non-U.S., expected contribution, 2010	2,000,000
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	$ 2,000,000