Employee Benefit Plans - Net Periodic Benefit (Income) Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Postemployment Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	$ 16	$ 17	$ 17
Interest cost	3	3	5
Prior service cost	(6)	(4)	(4)
Actuarial loss	(7)	0	(2)
Net benefit cost	6	16	16
Restructuring severance cost	4	1	73
Net periodic benefit cost	10	17	89
Postretirement Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	0	0	0
Interest cost	1	1	1
Prior service cost	(14)	(18)	(18)
Actuarial loss	2	2	2
Net periodic benefit cost	(11)	(15)	(15)
Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	7	12	12
Interest cost	118	129	211
Expected return on plan assets	(108)	(132)	(222)
Prior service cost	1	1	2
Actuarial loss	85	29	150
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	(2)	0
Settlement charge	0	427	(1)
Net periodic benefit cost	103	464	152
Company contributions	31	33
Pension liability	0	(425)
U.S. Pension Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	0	0	0
Interest cost	90	87	130
Expected return on plan assets	(72)	(72)	(118)
Prior service cost	0	0	0
Actuarial loss	16	27	146
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	0	0
Settlement charge	0	0	0
Net periodic benefit cost	34	42	158
Company contributions	0	0
Pension liability	0	0
International Pension Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	7	12	12
Interest cost	28	42	81
Expected return on plan assets	(36)	(60)	(104)
Prior service cost	1	1	2
Actuarial loss	69	2	4
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	0	(2)	0
Settlement charge	0	427	(1)
Net periodic benefit cost	69	422	$ (6)
Company contributions	31	33
Pension liability	$ 0	$ (425)