Employee Benefit Plans - (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Components of net periodic benefit cost [Abstract]
Defined Benefit Plan, Contributions by Employer	$ 7
Defined Contribution Plan, Cost Recognized	49
U.S. Pension Benefits
Components of net periodic benefit cost [Abstract]
Service cost	13	$ 18
Interest cost	7	7
Expected return on plan assets	(10)	(13)
Amortization of prior service credit	0	0
Amortization of net actuarial loss	3	2
Curtailment gain	0	0
Net periodic cost	13	14
Non-U.S. Pension Benefits
Components of net periodic benefit cost [Abstract]
Service cost	4	4
Interest cost	7	8
Expected return on plan assets	(9)	(12)
Amortization of prior service credit	0	0
Amortization of net actuarial loss	1	1
Curtailment gain	0	0
Net periodic cost	3	1
Other Postretirement Benefits
Components of net periodic benefit cost [Abstract]
Service cost	1	1
Interest cost	1	1
Expected return on plan assets	0	0
Amortization of prior service credit	(2)	(3)
Amortization of net actuarial loss	0	1
Curtailment gain	0	(9)
Net periodic cost	0	$ (9)
Minimum [Member]
Components of net periodic benefit cost [Abstract]
Defined Contribution Plan, Estimated Future Employer Contributions in Current Fiscal Year	38
Minimum [Member] | Pension Plan [Member]
Components of net periodic benefit cost [Abstract]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	51
Minimum [Member] | Other Postretirement Benefits
Components of net periodic benefit cost [Abstract]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	11
Maximum [Member]
Components of net periodic benefit cost [Abstract]
Defined Contribution Plan, Estimated Future Employer Contributions in Current Fiscal Year	40
Maximum [Member] | Pension Plan [Member]
Components of net periodic benefit cost [Abstract]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	55
Maximum [Member] | Other Postretirement Benefits
Components of net periodic benefit cost [Abstract]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	$ 15