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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allowance for doubtful accounts |  |  |
Valuation and qualifying accounts |  |  |
Balance at Beginning of Period | $ 668 | $ 594 | $ 558
Charged to Costs and Expenses | 126 | 77 | 37
Charged to Other Accounts | (6) | (3) | (2)
Deductions | 0 | 0 | 1
Balance at End of Period | 788 | 668 | 594
Valuation allowance and reserves, current | 22 | 24 | 18
Environmental, litigation and other reserves |  |  |
Valuation and qualifying accounts |  |  |
Balance at Beginning of Period | 994 | 935 | 997
Charged to Costs and Expenses | 182 | 140 | 45
Charged to Other Accounts | 1,408 | 85 | 53
Deductions | (173) | (166) | (160)
Balance at End of Period | 2,411 | 994 | 935
Valuation allowance and reserves, current | $ 188 | $ 146 | $ 163

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