Postretirement Benefits (Details) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 29, 2012	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Pension Contributions [Abstract]
Contributions to pension plans		$ 119,000,000	$ 104,000,000	$ 293,000,000	$ 235,000,000
Expected full year contributions pension plans during the year		1,000,000,000		1,000,000,000
Amount of employer contribution required in current year		570,000,000		570,000,000
U.S. Pension Benefits
Components of net periodic benefit cost
Service cost		46,000,000	38,000,000	92,000,000	77,000,000
Interest cost		154,000,000	162,000,000	308,000,000	324,000,000
Expected return on plan assets		(203,000,000)	(199,000,000)	(406,000,000)	(398,000,000)
Amortization of:
Transition obligation / (asset)				0	0
Prior service cost / (credit)		5,000,000	5,000,000	10,000,000	10,000,000
Net actuarial loss / (gain)		124,000,000	113,000,000	248,000,000	226,000,000
Net periodic benefit cost, excluding curtailments, settlements and special termination benefits		126,000,000	119,000,000	252,000,000	239,000,000
Curtailments, settlements and special termination benefits		0	0	0	0
Total cost included in operating profit		126,000,000	119,000,000	252,000,000	239,000,000
Weighted-average assumptions used to determine net cost:
Discount rate (as a percent)				4.30%	5.10%
Expected return on plan assets (as a percent)				8.00%	8.50%
Rate of compensation increase (as a percent)				4.50%	4.50%
Non-U.S. Pension Benefits
Components of net periodic benefit cost
Service cost		28,000,000	28,000,000	56,000,000	55,000,000
Interest cost		46,000,000	44,000,000	91,000,000	87,000,000
Expected return on plan assets		(53,000,000)	(50,000,000)	(107,000,000)	(100,000,000)
Amortization of:
Transition obligation / (asset)				0	0
Prior service cost / (credit)		0	0	0	1,000,000
Net actuarial loss / (gain)		24,000,000	18,000,000	48,000,000	36,000,000
Net periodic benefit cost, excluding curtailments, settlements and special termination benefits		45,000,000	40,000,000	88,000,000	79,000,000
Curtailments, settlements and special termination benefits	10,000,000	12,000,000	9,000,000	22,000,000	9,000,000
Total cost included in operating profit		57,000,000	49,000,000	110,000,000	88,000,000
Weighted-average assumptions used to determine net cost:
Discount rate (as a percent)				4.30%	4.60%
Expected return on plan assets (as a percent)				7.10%	7.10%
Rate of compensation increase (as a percent)				3.90%	4.20%
Other Postretirement Benefits
Defined Benefit Plan Disclosure
Defined Benefit Plan Loss on Third Party Receivable	21,000,000
Components of net periodic benefit cost
Service cost		22,000,000	20,000,000	46,000,000	41,000,000
Interest cost		56,000,000	63,000,000	111,000,000	126,000,000
Expected return on plan assets		(16,000,000)	(17,000,000)	(32,000,000)	(35,000,000)
Amortization of:
Transition obligation / (asset)				1,000,000	1,000,000
Prior service cost / (credit)		(16,000,000)	(13,000,000)	(33,000,000)	(27,000,000)
Net actuarial loss / (gain)		25,000,000	27,000,000	50,000,000	54,000,000
Net periodic benefit cost, excluding curtailments, settlements and special termination benefits		71,000,000	80,000,000	143,000,000	160,000,000
Curtailments, settlements and special termination benefits	(37,000,000)	0	0	(40,000,000)	0
Total cost included in operating profit		$ 71,000,000	$ 80,000,000	$ 103,000,000	$ 160,000,000
Weighted-average assumptions used to determine net cost:
Discount rate (as a percent)				4.30%	5.00%
Expected return on plan assets (as a percent)				8.00%	8.50%
Rate of compensation increase (as a percent)				4.40%	4.40%