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Contract Asset and Liability (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Revenue from contract with customer [Line Items] |  |  |
Contract assets | $ 10,238 |  | $ 9,931
Contract liabilities | (12,879) |  | (12,889)
Net contract liabilities | (2,641) |  | (2,958)
Contract with Customer, Asset, Change | 307 |  |
Contract with Customer, Liability, Revenue Recognized | 1,705 | $ 1,183 |
Advances received to date on contracts related to precision guided munitions to certain Middle Eastern customers pending U.S. government approval | 440 |  |
Contract with Customer, Asset, Allowance for Credit Loss | $ 222 |  | $ 177

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