Employee Benefit Plans - Pension (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	$ 2	$ 3	$ 6	$ 9
Interest cost	30	29	89	100
Expected return on plan assets	(28)	(29)	(82)	(104)
Amortization of prior service cost	1	1	1	1
Curtailment	0	1	0	(2)
Settlement			0	427
Net benefit cost	5	5	14	431
United States Pension Plan of US Entity [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	0	0	0	0
Interest cost	23	22	68	66
Expected return on plan assets	(18)	(18)	(54)	(54)
Amortization of prior service cost	0	0	0	0
Curtailment	0	0	0	0
Settlement			0	0
Net benefit cost	5	4	14	12
International Pension Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Net service cost	2	3	6	9
Interest cost	7	7	21	34
Expected return on plan assets	(10)	(11)	(28)	(50)
Amortization of prior service cost	1	1	1	1
Curtailment	0	1	0	(2)
Settlement		0	0	427
Net benefit cost	$ 0	$ 1	$ 0	$ 419