Note 10. Income Taxes Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred income tax assets:
Net operating loss carryforwards	$ 288	$ 503
Tax credit carryforwards	35	41
Accrued liabilities and deferred income	85	131
Minimum pension obligations	16	23
Provision for doubtful accounts	8	16
Liability for unrecognized tax benefits	1	3
Deferred Tax Assets, Derivative Instruments	2	8
Total deferred tax assets	435	725
Less: valuation allowance	(13)	(10)
Total deferred income tax assets after valuation allowance	422	715
Deferred income tax liabilities:
Depreciation and amortization	736	1,099
Prepaid expenses	2	1
Undistributed foreign earnings	0	2
Basis difference in investment in joint ventures	10	2
Total deferred tax liabilities	748	1,104
Net deferred income tax liabilities	(326)	(389)
Deferred Tax Assets, Net, Classification [Abstract]
Net deferred income tax liabilities	(326)	(389)
Deferred income taxes	327	$ 389
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent	1
Operating Loss Carryforwards	$ 1,026