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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Allowance for credit losses |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning Period | $ 13 | $ 14 | $ 9
Charged to Costs and Expenses | 0 | 11 | 13
Charged to Other Accounts | 0 | 0 | 3
Deductions | 0 | (12) | (11)
Balance at End of Period | 13 | 13 | 14
Reserve for losses on uncompleted contracts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning Period | 16 | 10 | 6
Charged to Costs and Expenses | 4 | 14 | 12
Charged to Other Accounts | 0 | 0 | 0
Deductions | (3) | (8) | (8)
Balance at End of Period | 17 | 16 | 10
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 | 54 | 58 | 55
Charged to Costs and Expenses | 42 | 24 | 5
Charged to Other Accounts | 0 | 0 | 0
Deductions | (20) | (28) | (2)
Balance at End of Period | $ 76 | $ 54 | $ 58

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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