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Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Capitalized repair and maintenance costs	$ 198	$ 148
Pension assets	79	59
Deferred income taxes	95	40
Miscellaneous	33	45
Total other assets	$ 405	$ 292

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Capitalized repair and maintenance costs.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and other assets expected to be realized or consumed after one year or normal operating cycle, if longer.

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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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