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Debt - Borrowings and Repayments (Detail) - USD ($)
$ in Millions
3 Months Ended
Feb. 08, 2022
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Debt        
New borrowings   $ 2,362    
Unamortized discounts and debt issuance costs   78   $ 80
Debt repayments   2,471 $ 329  
Commercial Paper Program [Member]        
Debt        
Commercial paper repayments   2,500    
Commercial paper borrowings   2,400    
Financing leases and other [Member]        
Debt        
Debt repayments   19    
Financing leases and other [Member] | Low income housing investments [Member]        
Debt        
Note issued $ 183 $ 183