Contracts with Customers - Schedule of Unbilled Receivables and Claims) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Contracts with Customers [Abstract]
Contract with customers, unbilled, current	$ 6,565	$ 6,478
Contract with customers, expected to be collected after one year	1,771	2,179
Contract with customers, less valuation allowance	(19)	(23)	$ (91)
Total unbilled receivables	8,317	8,634
Contracts with customers, claims, current	6
Contract with customers, claims, expected to be collected after one year	40	16
Total claims receivables	$ 46	$ 16