Employee Benefit Plans - Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Recognized curtailment gain		$ (22)
Defined Benefit Plans			$ 142	$ 82	$ 267
Net actuarial (gain) loss			(73)	(1,291)	729
Amortization of net actuarial loss	[1]		(126)	(83)	(172)
Amortization of net prior service credit	[1]		(38)	(46)	(45)
Curtailment gain	[1]		(186)	(121)	(260)
Total Recognized in Other Comprehensive Income			(212)	1,070	(950)
Interest Expense on Non-TRA Obligations			320	371	349
Interest Expense Allocated to TRA Participant Accounts			(25)	182	65
Expected Investment Income on Non-TRA Assets			401	450	431
Actual Investment Income on TRA Assets			(25)	182	65
United States Pension Plan of US Entity [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost			4	9	10
Interest cost	[2]		83	281	154
Expected return on plan assets	[3]		(83)	(290)	(179)
Recognized net actuarial loss			24	17	19
Amortization of prior service credit			(2)	(2)	(2)
Recognized settlement loss			88	51	162
Recognized curtailment gain			0	0	0
Defined Benefit Plans			114	66	164
Defined contribution plans			61	58	64
Net Periodic Benefit Cost			175	124	228
Net actuarial (gain) loss			(70)	697	(403)
Prior service credit			0	0	0
Amortization of net actuarial loss			(112)	(68)	(181)
Amortization of net prior service credit			2	2	2
Curtailment gain			0	0	0
Total Recognized in Other Comprehensive Income			(180)	631	(582)
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income			(5)	755	(354)
Foreign Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost			32	34	91
Interest cost	[2]		212	272	260
Expected return on plan assets			(293)	(342)	(317)
Recognized net actuarial loss			72	54	77
Amortization of prior service credit			4	(1)	0
Recognized settlement loss			1	0	0
Recognized curtailment gain			0	(1)	(8)
Defined Benefit Plans			28	16	103
Defined contribution plans			39	44	25
Net Periodic Benefit Cost			67	60	128
Net actuarial (gain) loss			195	481	(224)
Prior service credit			(16)	(6)	(14)
Amortization of net actuarial loss			(73)	(54)	(77)
Amortization of net prior service credit			(4)	1	0
Curtailment gain			0	2	0
Total Recognized in Other Comprehensive Income			102	424	(315)
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income			169	484	(187)
Postretirement Health Coverage [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost			7	9	9
Interest cost	[2]		34	36	33
Expected return on plan assets			0	0	0
Recognized net actuarial loss			1	1	2
Amortization of prior service credit			(18)	(43)	(43)
Recognized settlement loss			0	0	0
Recognized curtailment gain			(22)	0	0
Defined Benefit Plans			2	3	1
Net Periodic Benefit Cost			2	3	1
Net actuarial (gain) loss			(4)	119	(88)
Prior service credit			(32)	0	0
Amortization of net actuarial loss			(1)	(1)	(2)
Amortization of net prior service credit			18	43	43
Curtailment gain			22
Total Recognized in Other Comprehensive Income			3	161	(47)
Total Recognized in Net Periodic Benefit Cost and Other Comprehensive Income			5	$ 164	$ (46)
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			(89)
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			(3)
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			5
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			$ 5

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

[2] Interest cost includes interest expense on non-TRA obligations of $320, $371 and $349 and interest expense directly allocated to TRA participant accounts of $(25), $182 and $65 for the years ended December 31, 2015, 2014 and 2013, respectively.

[3] Expected return on plan assets includes expected investment income on non-TRA assets of $401, $450 and $431 and actual investment income on TRA assets of $(25), $182 and $65 for the years ended December 31, 2015, 2014 and 2013, respectively.