Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
United States Pension Plans of US Entity, Defined Benefit [Member]
Components of net periodic benefit costs
Service costs	$ 56	$ 47
Interest costs	101	101
Expected return on plan assets	(121)	(112)
Amortization of net actuarial (gains) losses	49	49
Amortization of prior service costs (credit)	2	1
Net periodic benefit costs	87	86
Foreign Pension Plans, Defined Benefit [Member]
Components of net periodic benefit costs
Service costs	20	16
Interest costs	4	4
Expected return on plan assets	(2)	(2)
Amortization of net actuarial (gains) losses	0	0
Amortization of prior service costs (credit)	0	0
Net periodic benefit costs	22	18
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Components of net periodic benefit costs
Service costs	5	4
Interest costs	26	26
Expected return on plan assets	(19)	(19)
Amortization of net actuarial (gains) losses	14	11
Amortization of prior service costs (credit)	(26)	(27)
Net periodic benefit costs	0	(5)
Foreign Postretirement Benefit Plans, Defined Benefit [Member]
Components of net periodic benefit costs
Service costs	0	1
Interest costs	1	1
Expected return on plan assets	0	(1)
Amortization of net actuarial (gains) losses	0	0
Amortization of prior service costs (credit)	0	0
Net periodic benefit costs	$ 1	$ 1