Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
United States Pension Plans of US Entity, Defined Benefit [Member]
Components of net periodic benefit costs
Service costs	$ 56	$ 47	$ 168	$ 141
Interest costs	102	101	305	303
Expected return on plan assets	(121)	(112)	(363)	(336)
Amortization of net actuarial (gains) losses	48	49	146	146
Amortization of prior service costs (credit)	2	1	5	3
Net periodic benefit costs	87	86	261	257
Foreign Pension Plans, Defined Benefit [Member]
Components of net periodic benefit costs
Service costs	19	17	55	49
Interest costs	4	3	13	11
Expected return on plan assets	(1)	0	(5)	(3)
Amortization of net actuarial (gains) losses	0	0	0	0
Amortization of prior service costs (credit)	0	0	0	0
Net periodic benefit costs	22	20	63	57
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Components of net periodic benefit costs
Service costs	5	4	16	12
Interest costs	26	26	77	79
Expected return on plan assets	(19)	(19)	(57)	(57)
Amortization of net actuarial (gains) losses	15	11	43	32
Amortization of prior service costs (credit)	(26)	(27)	(78)	(81)
Net periodic benefit costs	1	(5)	1	(15)
Foreign Postretirement Benefit Plans, Defined Benefit [Member]
Components of net periodic benefit costs
Service costs	0	0	1	1
Interest costs	1	1	2	2
Expected return on plan assets	(1)	0	(1)	(1)
Amortization of net actuarial (gains) losses	1	0	1	0
Amortization of prior service costs (credit)	0	0	0	0
Net periodic benefit costs	$ 1	$ 1	$ 3	$ 2