Income Taxes - Schedule of Principal Components of Deferred Tax Items (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets related to:
Reserves and other accrued expenses	$ 0	$ 90
Pension obligations	0	6
Employee related liabilities	176	171
Deferred revenues	34	44
Net operating losses and tax credit carryforwards	3,122	3,116
U.S. foreign tax credits on undistributed earnings	252	330
Foreign exchange loss	33	32
Total deferred tax assets	3,617	3,789
Valuation allowance	(2,520)	(2,694)
Realizable deferred tax assets	1,097	1,095
Deferred tax liabilities related to:
Property, equipment, and intangibles	(969)	(1,019)
Reserves and other accrued expenses	(49)	0
Pension obligations	(4)	0
Investment in affiliates and other	(217)	(306)
U.S. tax on foreign undistributed earnings	(252)	(192)
Total deferred tax liabilities	(1,491)	(1,517)
Net deferred tax liabilities	$ (394)	$ (422)

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.