Pension, Other Postretirement Benefits and Savings Plans (Weighted Assumptions) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate:	3.89%	4.51%
Discount rate: (benefit costs)	4.40%	3.77%	4.52%
Expected long term return on plan assets:	5.47%	7.16%	8.50%
Defined Benefit Plan, Accumulated Benefit Obligation	$ 6,495	$ 5,966
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation	5,087	4,101
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation	5,076	4,086
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets	4,822	2,869
Total recognized in other comprehensive (income) loss before tax and minority	2,981	2,837
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate:	3.31%	4.36%
Rate of compensation increase:	2.88%	3.11%
Discount rate: (benefit costs)	4.36%	4.12%	5.07%
Expected long term return on plan assets:	5.12%	5.01%	5.56%
Rate of compensation increase (benefit cost):	3.11%	3.23%	3.36%
Defined Benefit Plan, Accumulated Benefit Obligation	3,040	3,008
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation	1,112	2,106
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation	994	2,004
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets	384	1,375
Total recognized in other comprehensive (income) loss before tax and minority	858	988
U.S. Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate:	3.59%	4.06%
Discount rate: (benefit costs)	4.06%	3.30%	3.98%
Non-U.S. Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate:	4.89%	6.62%
Rate of compensation increase:		4.32%
Discount rate: (benefit costs)	6.62%	5.64%	5.91%
Rate of compensation increase (benefit cost):	4.32%	4.12%	3.71%
Certain Unfunded Non US Subsidiaries
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Accumulated Benefit Obligation	288	303
Defined Benefit Plan, Benefit Obligation	(348)	(352)
Total recognized in other comprehensive (income) loss before tax and minority	$ 132	$ 73