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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 |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning Period | $ 9 | $ 12 | $ 14
Charged to Costs and Expenses | 13 | 3 | 0
Charged to Other Accounts | 3 | 0 | 0
Deductions | (11) | (6) | (2)
Balance at End of Period | 14 | 9 | 12
Reserve for losses on uncompleted contracts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning Period | 6 | 15 | 63
Charged to Costs and Expenses | 12 | 9 | 4
Charged to Other Accounts | 0 | 0 | 0
Deductions | (8) | (18) | (52)
Balance at End of Period | 10 | 6 | 15
Reserve for potentially disallowable costs incurred under government contracts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning Period | 55 | 60 | 73
Charged to Costs and Expenses | 5 | 13 | 1
Charged to Other Accounts | 0 | 2 | 0
Deductions | (2) | (20) | (14)
Balance at End of Period | $ 58 | 55 | $ 60
SGT |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Reserves charged to other accounts |  | $ 2 |

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