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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2022
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
Schedule II
Valuation and Qualifying Accounts
For the Years Ended December 31, 2022, 2021 and 2020 
(In millions)
 
Description
Balance at
Beginning of
Period		Additions
Charged to
Costs and
Expenses		DeductionsOtherBalance at
End of
Period
Allowance for credit losses - receivables:
2022$28 $22 $39 $— $11 
202178 3 53 — 28 
20209 70 16 15 78 
Obsolescence allowance—spare parts:
2022$546 $73 $9 $— $610 
2021478 79 11 — 546 
2020425 88 35 — 478 
Allowance for credit losses - notes receivable:
2022$622 $20 $539 $(82)$21 
2021522 1 — 99 622 
2020— 518 — 4 522 
Valuation allowance for deferred tax assets:
2022$210 $(10)$— $(1)$199 
2021247 (38)— 1 210 
202058 197 8 — 247