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Revenues and Contract Costs - Contract Balances (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Revenue from Contract with Customer [Abstract]          
Contract asset $ 790   $ 790   $ 863
Contract liability 8,629   8,629   $ 8,234
Revenue recognized related to contract liabilities existing $ 202 $ 167 $ 4,800 $ 4,800