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GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - INVENTORIES AND SUPPLIES - NET (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Accounting Policies [Abstract] |  |
Allowance for all non-surplus expendable inventories | $ 41 | $ 39
Fuel inventory | $ 28 | $ 24

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