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Revenue - Contract Balances (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Revenue from Contract with Customer [Abstract]        
Trade receivables, net $ 2,536 $ 2,871    
Contract assets 369 351    
Contract liabilities $ 1,883 $ 1,701 $ 1,768 $ 1,756