Income Taxes - Schedule of Principal Components of Deferred Tax Items (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets related to:
Reserves and other accrued expenses	$ 90	$ 266
Pension obligations	6	0
Employee related liabilities	171	84
Deferred revenues	44	30
Net operating losses and tax credit carryforwards	3,116	2,160
U.S. foreign tax credits on undistributed earnings	330	280
Foreign exchange (gain)/loss	32	52
Total deferred tax assets	3,789	2,872
Valuation allowance	(2,694)	(1,694)
Realizable deferred tax assets	1,095	1,178
Deferred tax liabilities related to:
Property, equipment, and intangibles	(1,019)	(1,083)
Pension obligations	0	(2)
Investment in affiliates and other	(306)	(331)
U.S. tax on foreign undistributed earnings	(192)	(185)
Total deferred tax liabilities	(1,517)	(1,601)
Net deferred tax liabilities	$ (422)	$ (423)

Represents the amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards and the tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

No definition available.