Employee Benefit Plans - Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plans	$ 82		$ 267		$ 300
Net actuarial loss (gain)	(1,291)		729		(852)
Amortization of net prior service credit	(83)	[1]	(172)	[1]	(124)	[1]
Amortization of net prior service credit	(46)	[1]	(45)	[1]	(64)	[1]
Curtailment gain	(121)	[1]	(260)	[1]	(190)	[1]
Total Recognized in Other Comprehensive Income	1,070		(950)		794
Interest Expense on Non-TRA Obligations	371		349		382
Interest Expense Allocated to TRA Participant Accounts	182		65		170
Expected Investment Income on Non-TRA Assets	450		431		443
Actual Investment Income on TRA Assets	182		65		170
United States Pension Plan of US Entity [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	9		10		112
Interest cost	281	[2]	154	[2]	282	[2]
Expected return on plan assets	(290)	[3]	(179)	[3]	(306)	[3]
Recognized net actuarial loss	17		19		53
Amortization of prior service credit	(2)		(2)		(23)
Recognized settlement loss	51		162		82
Recognized curtailment gain	0		0		0
Defined Benefit Plans	66		164		200
Defined contribution plans (3)	58	[4]	64	[4]	28	[4]
Net Periodic Benefit Cost	124		228		228
Net actuarial loss (gain)	697		(403)		427
Prior service credit	0		0		(2)
Amortization of net prior service credit	(68)		(181)		(135)
Amortization of net prior service credit	2		2		23
Curtailment gain	0		0		0
Total Recognized in Other Comprehensive Income	631		(582)		313
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	755		(354)		541
Foreign Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	34		91		83
Interest cost	272	[2]	260	[2]	270	[2]
Expected return on plan assets	(342)		(317)		(307)
Recognized net actuarial loss	54		77		53
Amortization of prior service credit	(1)		0		0
Recognized settlement loss	0		0		1
Recognized curtailment gain	(1)		(8)		0
Defined Benefit Plans	16		103		100
Defined contribution plans (3)	44	[4]	25	[4]	33	[4]
Net Periodic Benefit Cost	60		128		133
Net actuarial loss (gain)	481		(224)		416
Prior service credit	(6)		(14)		(1)
Amortization of net prior service credit	(54)		(77)		(54)
Amortization of net prior service credit	1		0		0
Curtailment gain	2		0		0
Total Recognized in Other Comprehensive Income	424		(315)		361
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	484		(187)		494
Postretirement Health Coverage [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	9		9		9
Interest cost	36	[2]	33	[2]	42	[2]
Expected return on plan assets	0		0		0
Recognized net actuarial loss	1		2		1
Amortization of prior service credit	(43)		(43)		(41)
Defined Benefit Plans	3		1		11
Net Periodic Benefit Cost	3		1		11
Net actuarial loss (gain)	119		(88)		18
Prior service credit	0		0		(6)
Amortization of net prior service credit	(1)		(2)		(1)
Amortization of net prior service credit	43		43		41
Total Recognized in Other Comprehensive Income	161		(47)		52
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income	164		(46)		63
Benefit plans net actuarial loss [Member] | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	111
Benefit plans net actuarial loss [Member] | Other Postretirement Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	5
Benefit plans prior service credits [Member] | Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	(4)
Benefit plans prior service credits [Member] | Other Postretirement Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	$ (30)

[1] (2)Reclassified to Total Net Periodic Benefit Cost - refer to Note 16 - Employee Benefit Plans for additional information.

[2] (1)Interest cost includes interest expense on non-TRA obligations of $371, $349 and $382 and interest expense directly allocated to TRA participant accounts of $182, $65 and $170 for the years ended December 31, 2014, 2013 and 2012, respectively.

[3] (2)Expected return on plan assets includes expected investment income on non-TRA assets of $450, $431 and $443 and actual investment income on TRA assets of $182, $65 and $170 for the years ended December 31, 2014, 2013 and 2012, respectively.

[4] (3)Excludes contributions related to our ITO business, which is held for sale and reported as a discontinued operation at December 31, 2014. Refer to Note 4 - Divestitures for additional information regarding this pending sale.