Fair Value Measurements (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Level 3
Liabilities
Guarantees	$ 1	$ 1
Recurring basis
Assets
Derivative financial instruments, net	84	78
Total Assets	84	78
Liabilities
Guarantees	1	1
Total Liabilities	1	1
Recurring basis | Level 1
Assets
Derivative financial instruments, net	0	0
Total Assets	0	0
Liabilities
Guarantees	0	0
Total Liabilities	0	0
Recurring basis | Level 2
Assets
Derivative financial instruments, net	84	78
Total Assets	84	78
Liabilities
Guarantees	0	0
Total Liabilities	0	0
Recurring basis | Level 3
Assets
Derivative financial instruments, net	0	0
Total Assets	0	0
Liabilities
Guarantees	1	1
Total Liabilities	$ 1	$ 1