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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