Employee Retirement Benefits (Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
U.S. Plan
Amounts recognized in balance sheet:
Funded status of plan	$ (107)	$ (108)
Prior service credit (cost)	2	13
Net gain (loss)	(97)	(94)
Accumulated other comprehensive income (loss)	(95)	(81)
Unfunded accrued pension or postretirement benefit	(12)	(27)
Net obligation recognized in the balance sheet	(107)	(108)
Total recognized in other comprehensive (income) loss	14	(79)
Total recognized in net periodic benefit cost and other comprehensive (income) loss	33	(52)
Estimated amounts that will be amortized from accumulated other comprehensive (income) loss over the next fiscal year:
Net gain (loss)	(2)	(2)
Accumulated Benefit Obligation at December 31	$ 720	$ 626
Weighted-average assumptions as of December 31
Discount rate (as a percent)	3.90%	4.80%
Expected return of assets (as a percent)	7.40%	7.60%
Average rate of increase in compensation (as a percent)	4.00%	4.60%
Components of Net Periodic Benefit Cost:
Service cost	$ 28	$ 27	$ 25
Interest cost	31	28	28
Expected return on plan assets	(40)	(36)	(34)
Net amortizations	2	7	10
Settlement loss	4	0	2
Curtailment gain	(10)	0	0
Special termination benefit cost	4
Net pension and postretirement expense	$ 19	$ 26	$ 31
Weighted average discount rate for expense (January 1)	4.80%	4.00%	4.70%
Weighted average assumed long-term rate of return on assets (January 1)	7.60%	7.60%	8.00%
Pension Benefits - Non-U.S.
Amounts recognized in balance sheet:
Funded status of plan	$ (62)	$ (36)
Prior service credit (cost)	0	0
Net gain (loss)	(50)	(12)
Accumulated other comprehensive income (loss)	(50)	(12)
Unfunded accrued pension or postretirement benefit	(12)	(24)
Net obligation recognized in the balance sheet	(62)	(36)
Total recognized in other comprehensive (income) loss	38	(5)
Total recognized in net periodic benefit cost and other comprehensive (income) loss	35	(6)
Estimated amounts that will be amortized from accumulated other comprehensive (income) loss over the next fiscal year:
Net gain (loss)	(2)	0
Accumulated Benefit Obligation at December 31	$ 272	$ 239
Weighted-average assumptions as of December 31
Discount rate (as a percent)	4.40%	4.40%
Expected return of assets (as a percent)	7.40%	7.40%
Average rate of increase in compensation (as a percent)	2.60%	2.60%
Components of Net Periodic Benefit Cost:
Service cost	$ 2	$ 3	$ 2
Interest cost	10	9	10
Expected return on plan assets	(15)	(13)	(12)
Net amortizations	0	0	0
Settlement loss	0	0	0
Curtailment gain	0	0	0
Special termination benefit cost			0
Net pension and postretirement expense	$ (3)	$ (1)	$ 0
Weighted average discount rate for expense (January 1)	3.20%	4.30%	4.80%
Weighted average assumed long-term rate of return on assets (January 1)	7.40%	7.40%	7.40%
Postretirement Benefits (U.S.)
Amounts recognized in balance sheet:
Funded status of plan	$ (15)	$ (16)
Prior service credit (cost)	0	0
Net gain (loss)	1	0
Accumulated other comprehensive income (loss)	1	0
Unfunded accrued pension or postretirement benefit	(16)	(16)
Net obligation recognized in the balance sheet	(15)	(16)
Total recognized in other comprehensive (income) loss	0	(3)
Total recognized in net periodic benefit cost and other comprehensive (income) loss	1	(2)
Estimated amounts that will be amortized from accumulated other comprehensive (income) loss over the next fiscal year:
Net gain (loss)	$ 0	$ 0
Weighted-average assumptions as of December 31
Discount rate (as a percent)	3.60%	4.40%
Expected return of assets (as a percent)	0.00%
Average rate of increase in compensation (as a percent)	0.00%
Initial health care cost trend rate (as a percent)	7.30%	7.50%
Ultimate health care cost trend rate (as a percent)	4.50%	4.50%
Number of years to ultimate trend rate (in years)	15 years	16 years
Components of Net Periodic Benefit Cost:
Service cost	$ 0	$ 0	$ 0
Interest cost	1	1	1
Expected return on plan assets	0	0	0
Net amortizations	0	0	0
Settlement loss	0	0	0
Curtailment gain	0	0	0
Net pension and postretirement expense	$ 1	$ 1	$ 1
Weighted average discount rate for expense (January 1)	4.40%	3.60%	4.40%
Initial health care cost trend rate (as a percent)	7.50%	7.80%	8.10%
Ultimate health care cost trend rate (as a percent)	4.50%	4.50%	4.50%
Number of years to ultimate health trend rate (in years)	15 years	16 years	17 years