Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
United States Pension Plans of US Entity, Defined Benefit [Member]
Components of net periodic benefit costs
Service costs	$ 56	$ 47	$ 112	$ 94
Interest costs	102	101	203	202
Expected return on plan assets	(121)	(112)	(242)	(224)
Amortization of net actuarial (gains) losses	49	48	98	97
Amortization of prior service costs (credit)	1	1	3	2
Net periodic benefit costs	87	85	174	171
Foreign Pension Plans, Defined Benefit [Member]
Components of net periodic benefit costs
Service costs	16	16	36	32
Interest costs	5	4	9	8
Expected return on plan assets	(2)	(1)	(4)	(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	19	19	41	37
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Components of net periodic benefit costs
Service costs	6	4	11	8
Interest costs	25	27	51	53
Expected return on plan assets	(19)	(19)	(38)	(38)
Amortization of net actuarial (gains) losses	14	10	28	21
Amortization of prior service costs (credit)	(26)	(27)	(52)	(54)
Net periodic benefit costs	0	(5)	0	(10)
Foreign Postretirement Benefit Plans, Defined Benefit [Member]
Components of net periodic benefit costs
Service costs	1	0	1	1
Interest costs	0	0	1	1
Expected return on plan assets	0	0	0	(1)
Amortization of net actuarial (gains) losses	0	0	0	0
Amortization of prior service costs (credit)	0	0	0	0
Net periodic benefit costs	$ 1	$ 0	$ 2	$ 1