Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income:
Net actuarial gain	$ 0		$ 1
Amortization of net prior service credit	(11)	[1]	(16)	[1]
Amortization of net actuarial losses	75	[1]	43	[1]
Pension Benefits [Member]
Contributions [Abstract]
Defined Benefit Plan, Contributions by Employer	45
Anticipated additional contributions to the defined benefit and post retirement plans in current fiscal year	150
Anticipated total cash contributions to defined benefit and post retirement plans in the current year	195
Retiree Health [Member]
Components of Net Periodic Benefit Costs:
Service cost	2		2
Interest cost	9		11
Expected return on plan assets	0		0
Recognized net actuarial loss	1		0
Amortization of prior service credit	(11)		(10)
Recognized settlement loss	0		0
Defined benefit plans	1		3
Defined contribution plan	0		0
Net Periodic Benefit Cost	1		3
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income:
Net actuarial gain	0		0
Amortization of net prior service credit	11		10
Amortization of net actuarial losses	(1)		0
Total Recognized in Other Comprehensive Income	10	[2]	10	[2]
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	11		13
Contributions [Abstract]
Defined Benefit Plan, Contributions by Employer	22
Anticipated additional contributions to the defined benefit and post retirement plans in current fiscal year	58
Anticipated total cash contributions to defined benefit and post retirement plans in the current year	80
UNITED STATES | Pension Benefits [Member]
Components of Net Periodic Benefit Costs:
Service cost	2		30
Interest cost	37		47
Expected return on plan assets	(44)		(53)
Recognized net actuarial loss	7		14
Amortization of prior service credit	0		(6)
Recognized settlement loss	48		16
Defined benefit plans	50		48
Defined contribution plan	19		8
Net Periodic Benefit Cost	69		56
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income:
Net actuarial gain	0		0
Amortization of net prior service credit	0		6
Amortization of net actuarial losses	(55)		(30)
Total Recognized in Other Comprehensive Income	(55)	[2]	(24)	[2]
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	14		32
Contributions [Abstract]
Defined Benefit Plan, Contributions by Employer	7
Anticipated additional contributions to the defined benefit and post retirement plans in current fiscal year	19
Anticipated total cash contributions to defined benefit and post retirement plans in the current year	26
Foreign Pension Plans, Defined Benefit [Member] | Pension Benefits [Member]
Components of Net Periodic Benefit Costs:
Service cost	22		21
Interest cost	64		68
Expected return on plan assets	(77)		(76)
Recognized net actuarial loss	19		13
Amortization of prior service credit	0		0
Recognized settlement loss	0		0
Defined benefit plans	28		26
Defined contribution plan	7		8
Net Periodic Benefit Cost	35		34
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income:
Net actuarial gain	0		(1)
Amortization of net prior service credit	0		0
Amortization of net actuarial losses	(19)		(13)
Total Recognized in Other Comprehensive Income	(19)	[2]	(14)	[2]
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	16		20
Contributions [Abstract]
Defined Benefit Plan, Contributions by Employer	38
Anticipated additional contributions to the defined benefit and post retirement plans in current fiscal year	131
Anticipated total cash contributions to defined benefit and post retirement plans in the current year	$ 169

[1] Reclassified to Total Net Periodic Benefit Cost - refer to Note 13 - Employee Benefit Plans for additional information.

[2] (1)Amounts represent the pre-tax effect included within Other comprehensive income. Refer to Note 15 - Other Comprehensive Income for related tax effects and the after-tax amounts.