Employee Benefit Plans - (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Components of net periodic benefit cost [Abstract]
Defined Benefit Plan, Contributions by Employer			$ 24
Defined Contribution Plan, Cost Recognized			65
U.S. Pension Benefits
Components of net periodic benefit cost [Abstract]
Service cost	$ 13	$ 16	26	$ 34
Interest cost	7	7	14	14
Expected return on plan assets	(10)	(12)	(20)	(25)
Amortization of prior service credit	0	0	0	0
Amortization of net actuarial loss	2	2	5	4
Curtailment gain			0	0
Net periodic cost	12	13	25	27
Non-U.S. Pension Benefits
Components of net periodic benefit cost [Abstract]
Service cost	3	4	7	8
Interest cost	7	8	14	16
Expected return on plan assets	(9)	(12)	(18)	(24)
Amortization of prior service credit	0	0	0	0
Amortization of net actuarial loss	2	1	3	2
Curtailment gain			0	0
Net periodic cost	3	1	6	2
Other Postretirement Benefits
Components of net periodic benefit cost [Abstract]
Service cost	1	1	2	2
Interest cost	1	1	2	2
Expected return on plan assets	0	0	0	0
Amortization of prior service credit	(2)	(3)	(4)	(6)
Amortization of net actuarial loss	0	1	0	2
Curtailment gain			0	(9)
Net periodic cost	$ 0	$ 0	0	$ (9)
Minimum
Components of net periodic benefit cost [Abstract]
Defined Contribution Plan, Estimated Future Employer Contributions in Current Fiscal Year			23
Minimum | Pension Plan [Member]
Components of net periodic benefit cost [Abstract]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year			38
Minimum | Other Postretirement Benefits
Components of net periodic benefit cost [Abstract]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year			7
Maximum
Components of net periodic benefit cost [Abstract]
Defined Contribution Plan, Estimated Future Employer Contributions in Current Fiscal Year			25
Maximum | Pension Plan [Member]
Components of net periodic benefit cost [Abstract]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year			42
Maximum | Other Postretirement Benefits
Components of net periodic benefit cost [Abstract]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year			$ 8