Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income:
Net actuarial gain	$ 25		$ 18		$ 25		$ 19
Amortization of net prior service credit	(11)	[1]	(16)	[1]	(22)	[1]	(32)	[1]
Amortization of net actuarial losses	58	[1]	41	[1]	132		84
Pension Benefits [Member]
Contributions [Abstract]
Defined Benefit Plan, Contributions by Employer					98
Anticipated additional contributions to the defined benefit and post retirement plans in current fiscal year					97
Anticipated total cash contributions to defined benefit and post retirement plans in the current year	195				195
Retiree Health [Member]
Components of Net Periodic Benefit Costs:
Service cost	2		2		5		4
Interest cost	8		11		17		22
Expected return on plan assets	0		0		0		0
Recognized net actuarial loss	1		1		1		1
Amortization of prior service credit	(11)		(11)		(22)		(21)
Recognized curtailment gain	0		0		0		0
Recognized settlement loss	0		0		0		0
Defined benefit plans	0		3		1		6
Defined contribution plan	0		0		0		0
Net Periodic Benefit Cost	0		3		1		6
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income:
Net actuarial gain	(36)		0		(36)		0
Amortization of net prior service credit	11		11		22		21
Amortization of net actuarial losses	(1)		(1)		(1)		(1)
Total Recognized in Other Comprehensive Income	(26)	[2]	10	[2]	(15)	[2]	20	[2]
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	(26)		13		(14)		26
Contributions [Abstract]
Defined Benefit Plan, Contributions by Employer					38
Anticipated additional contributions to the defined benefit and post retirement plans in current fiscal year					42
Anticipated total cash contributions to defined benefit and post retirement plans in the current year	80				80
United States | Pension Benefits [Member]
Components of Net Periodic Benefit Costs:
Service cost	3		25		5		55
Interest cost	35		46		72		93
Expected return on plan assets	(45)		(51)		(89)		(104)
Recognized net actuarial loss	7		13		14		27
Amortization of prior service credit	0		(5)		0		(11)
Recognized curtailment gain	0		0		0		0
Recognized settlement loss	31		14		79		30
Defined benefit plans	31		42		81		90
Defined contribution plan	19		7		38		15
Net Periodic Benefit Cost	50		49		119		105
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income:
Net actuarial gain	11		(18)		11		(18)
Amortization of net prior service credit	0		5		0		11
Amortization of net actuarial losses	(38)		(27)		(93)		(57)
Total Recognized in Other Comprehensive Income	(27)	[2]	(40)	[2]	(82)	[2]	(64)
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	23		9		37		41
Contributions [Abstract]
Defined Benefit Plan, Contributions by Employer					13
Anticipated additional contributions to the defined benefit and post retirement plans in current fiscal year					13
Anticipated total cash contributions to defined benefit and post retirement plans in the current year	26				26
Foreign Pension Plans, Defined Benefit [Member] | Pension Benefits [Member]
Components of Net Periodic Benefit Costs:
Service cost	23		21		45		42
Interest cost	65		67		129		135
Expected return on plan assets	(80)		(77)		(157)		(153)
Recognized net actuarial loss	19		13		38		26
Amortization of prior service credit	0		0		0		0
Recognized curtailment gain	(6)		0		(6)		0
Recognized settlement loss	0		0		0		0
Defined benefit plans	21		24		49		50
Defined contribution plan	6		8		13		16
Net Periodic Benefit Cost	27		32		62		66
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income:
Net actuarial gain	0		0		0		(1)
Amortization of net prior service credit	0		0		0		0
Amortization of net actuarial losses	(19)		(13)		(38)		(26)
Total Recognized in Other Comprehensive Income	(19)		(13)		(38)		(27)
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	8		19		24		39
Contributions [Abstract]
Defined Benefit Plan, Contributions by Employer					85
Anticipated additional contributions to the defined benefit and post retirement plans in current fiscal year					84
Anticipated total cash contributions to defined benefit and post retirement plans in the current year	$ 169				$ 169

[1] Reclassified to Total Net Periodic Benefit Cost - refer to Note 14 - Employee Benefit Plans for additional information.

[2] (1)Amounts represent the pre-tax effect included within Other comprehensive income. Refer to Note 16 - Other Comprehensive Income for related tax effects and the after-tax amounts.