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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for doubtful accounts |  |  |
Valuation and qualifying accounts |  |  |
Balance at Beginning of Period | $ 788 | $ 668 | $ 594
Charged to Costs and Expenses | 37 | 126 | 77
Charged to Other Accounts | (3) | (6) | (3)
Deductions | 0 | 0 | 0
Balance at End of Period | 822 | 788 | 668
Valuation allowance and reserves, current | 42 | 22 | 24
Environmental, litigation and other reserves |  |  |
Valuation and qualifying accounts |  |  |
Balance at Beginning of Period | 2,411 | 994 | 935
Charged to Costs and Expenses | 115 | 182 | 140
Charged to Other Accounts | 43 | 1,408 | 85
Deductions | (140) | (173) | (166)
Balance at End of Period | 2,429 | 2,411 | 994
Environmental litigation tax and other reserves, current | $ 149 | $ 188 | $ 146

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