Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
Allowance for doubtful accounts receivable | |||
Reserves and allowances deducted from asset accounts | |||
Balance at the beginning of the period | $ 2 | $ 2 | |
Charge to cost and expenses | 0 | 0 | $ 0 |
Charge to other accounts | 2 | ||
Balance at the end of the period | 2 | 2 | 2 |
Allowance for obsolete materials and supplies | |||
Reserves and allowances deducted from asset accounts | |||
Balance at the beginning of the period | 183 | 143 | 127 |
Charge to cost and expenses | 16 | 43 | 25 |
Deductions | 3 | 9 | |
Balance at the end of the period | 199 | 183 | 143 |
Valuation allowance on deferred tax assets | |||
Reserves and allowances deducted from asset accounts | |||
Balance at the beginning of the period | 1,820 | 685 | 716 |
Charge to cost and expenses | 79 | 1,167 | (31) |
Charge to other accounts | 11 | ||
Deductions | 32 | ||
Balance at the end of the period | $ 1,910 | $ 1,820 | $ 685 |