Benefit Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Benefit Expenses
U.S Defined Contribution Plan Matching Contributions			100.00%
Defined Contribution Plan, matching contribution expenses	$ 2	$ 3	$ 7	$ 8
United States Pension Plan of US Entity [Member]
Benefit Expenses
Service cost	0	0	0	0
Interest cost	9	13	17	25
Expected return on plan assets	(10)	(16)	(21)	(31)
Amortization of losses and other	0	0	0	0
Net pension (income) expense	(1)	(3)	(4)	(6)
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year			1
Foreign Pension Plan [Member]
Benefit Expenses
Service cost	6	6	13	12
Interest cost	6	6	12	12
Expected return on plan assets	(5)	(4)	(11)	(8)
Amortization of losses and other	3	0	5	1
Net pension (income) expense	$ 10	$ 8	19	$ 17
Defined Benefit Plan, Contributions by Employer			11
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year			$ 21