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Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Millions
Oct. 01, 2021
Jan. 01, 2021
Revenue from Contract with Customer [Abstract]    
Contract assets $ 2,813 $ 2,437
Contract liabilities, current (1,174) (1,198)
Contract liabilities, non-current (98) (73)
Net contract assets 1,541 1,166
Components of Contract Assets:    
Unbilled contract receivables, gross 4,587 4,268
Unliquidated progress payments and advances (1,774) (1,831)
Contract assets $ 2,813 $ 2,437