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Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Capitalized repair and maintenance costs	$ 148	$ 178
Pension assets	59	174
Deferred income taxes	40	46
Miscellaneous	45	39
Total other assets	$ 292	$ 437

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Capitalized repair and maintenance costs.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting and classified as noncurrent.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.

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