Employee Benefit Plans (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Effects of change in the assumed health care cost-trend rates
Effect on total service and interest cost components, 1 Percent Increase	$ 13
Effect on total service and interest cost components, 1 Percent Decrease	(11)
Effect on postretirement benefit obligation, 1 Percent Increase	137
Effect on postretirement benefit obligation, 1 Percent Decrease	$ (115)
U.S. [Member]
Assumptions used to determine benefit obligations:
Discount rate	4.30%	3.60%	3.80%
Rate of compensation increase	4.50%	4.50%	4.50%
Assumptions used to determine net periodic benefit cost:
Discount rate	3.60%	3.80%	4.80%
Expected return on plan assets	7.50%	7.50%	7.80%
Rate of compensation increase	4.50%	4.50%	4.50%
International [Member]
Assumptions used to determine benefit obligations:
Discount rate	5.80%	5.20%	5.90%
Rate of compensation increase	5.50%	5.50%	5.70%
Assumptions used to determine net periodic benefit cost:
Discount rate	5.20%	5.90%	6.50%
Expected return on plan assets	6.80%	7.50%	7.80%
Rate of compensation increase	5.50%	5.70%	6.70%
Other Benefits [Member]
Assumptions used to determine benefit obligations:
Discount rate	4.90%	4.10%	4.20%
Assumptions used to determine net periodic benefit cost:
Discount rate	4.10%	4.20%	5.20%