Employee Benefit Plans - Change in Benefit Obligation and Plan Assets, Funded Status, Amounts Recognized in Balance Sheet, and ABO in Excess of Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension Plan [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation as of January 1	$ 3,314	$ 4,377
Net service cost	7	12	$ 12
Interest cost	118	129	211
Amendment	0	3
Actuarial loss	227	(110)
Benefits paid	(188)	(1,474)
Plan participant contributions	1	2
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	(2)	0
Settlements	0	425
Currency translation adjustments	(122)	(48)
Benefit obligation as of December 31	3,357	3,314	4,377
Accumulated benefit obligation as of December 31	3,347	3,303
Amounts recognized in the Consolidated Balance Sheets
Defined Benefit Plan, Benefit Obligation	(657)	(579)
Noncurrent assets	94	130
Current liabilities	(12)	(13)
Noncurrent liabilities	(739)	(696)
Net amounts recognized	(657)	(579)
Amounts recognized in the accumulated other comprehensive loss
Prior service cost	15	19
Total	15	19
Pension plans with accumulated benefit obligations in excess of plan assets, projected benefit obligation	2,711	2,692
Pension plans with accumulated benefit obligations in excess of plan assets, accumulated benefit obligation	2,702	2,682
Pension plans with accumulated benefit obligations in excess of plan assets, fair value of plan assets	1,991	2,013
U.S. Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation as of January 1	2,155	2,271
Net service cost	0	0	0
Interest cost	90	87	130
Amendment	0	0
Actuarial loss	53	(93)
Benefits paid	(113)	(110)
Plan participant contributions	0	0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	0	0
Settlements	0	0
Currency translation adjustments	0	0
Benefit obligation as of December 31	2,185	2,155	2,271
Accumulated benefit obligation as of December 31	2,185	2,155
Amounts recognized in the Consolidated Balance Sheets
Defined Benefit Plan, Benefit Obligation	(463)	(429)
Noncurrent assets	0	0
Current liabilities	0	0
Noncurrent liabilities	(463)	(429)
Net amounts recognized	(463)	(429)
Amounts recognized in the accumulated other comprehensive loss
Prior service cost	0	0
Total	0	0
International Pension Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation as of January 1	1,159	2,106
Net service cost	7	12	12
Interest cost	28	42	81
Amendment	0	3
Actuarial loss	174	(17)
Benefits paid	(75)	(1,364)
Plan participant contributions	1	2
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	(2)	0
Settlements	0	425
Currency translation adjustments	(122)	(48)
Benefit obligation as of December 31	1,172	1,159	2,106
Accumulated benefit obligation as of December 31	1,162	1,148
Amounts recognized in the Consolidated Balance Sheets
Defined Benefit Plan, Benefit Obligation	(194)	(150)
Noncurrent assets	94	130
Current liabilities	(12)	(13)
Noncurrent liabilities	(276)	(267)
Net amounts recognized	(194)	(150)
Amounts recognized in the accumulated other comprehensive loss
Prior service cost	15	19
Total	15	19
Postemployment Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation as of January 1	143	227
Restructuring program cost	4	1
Net service cost	16	17	17
Interest cost	3	3	5
Amendment	0	(12)
Actuarial loss	4	(34)
Benefits paid	(37)	(47)
Currency translation adjustments	(6)	(12)
Benefit obligation as of December 31	127	143	227
Amounts recognized in the Consolidated Balance Sheets
Defined Benefit Plan, Benefit Obligation	(127)	(143)
Current liabilities	(22)	(33)
Noncurrent liabilities	(105)	(110)
Net amounts recognized	(127)	(143)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	42	47
Amounts recognized in the accumulated other comprehensive loss
Prior service cost	(17)	(23)
Total	(59)	(70)
Postretirement Benefits [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation as of January 1	27	26
Net service cost	0	0	0
Interest cost	1	1	1
Actuarial loss	(2)	2
Benefits paid	(2)	(3)
Plan participant contributions	1	1
Benefit obligation as of December 31	25	27	$ 26
Amounts recognized in the Consolidated Balance Sheets
Defined Benefit Plan, Benefit Obligation	(25)	(27)
Current liabilities	(3)	(4)
Noncurrent liabilities	(22)	(23)
Net amounts recognized	(25)	(27)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax	(16)	(20)
Amounts recognized in the accumulated other comprehensive loss
Prior service cost	(19)	(33)
Total	$ (3)	$ (13)