Employee Benefit Plans (Details 5) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Effects of change in the assumed health care cost-trend rates
Effect on total service and interest cost components, 1 Percent Increase	$ 17
Effect on total service and interest cost components, 1 Percent Decrease	(15)
Effect on postretirement benefit obligation, 1 Percent Increase	156
Effect on postretirement benefit obligation, 1 Percent Decrease	$ (128)
U.S. [Member]
Assumptions used to determine benefit obligations:
Discount rate	3.90%	4.00%	3.70%
Rate of compensation increase	4.50%	4.50%	4.50%
Assumptions used to determine net periodic benefit cost:
Discount rate for service cost	4.40%	3.70%	4.30%
Discount rate for interest cost	3.00%	3.70%	4.30%
Expected return on plan assets	7.25%	7.50%	7.50%
Rate of compensation increase	4.50%	4.50%	4.50%
International [Member]
Assumptions used to determine benefit obligations:
Discount rate	4.30%	5.30%	5.00%
Rate of compensation increase	4.50%	4.80%	5.10%
Assumptions used to determine net periodic benefit cost:
Discount rate for service cost	5.30%	5.00%	5.80%
Discount rate for interest cost	5.30%	5.00%	5.80%
Expected return on plan assets	6.30%	6.30%	6.60%
Rate of compensation increase	4.80%	5.10%	5.50%
Other Benefits [Member]
Assumptions used to determine benefit obligations:
Discount rate	4.30%	4.60%	4.30%
Assumptions used to determine net periodic benefit cost:
Discount rate for service cost	4.90%	4.30%	4.90%
Discount rate for interest cost	4.00%	4.30%	4.90%