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Leases - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Leased Assets [Line Items]      
Total rental expense $ 1,200 $ 1,400 $ 1,700
Operating lease, asset $ 553 $ 710  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets  
Operating lease, liability $ 814 $ 1,000  
Operating lease, weighted average remaining lease term 10 years    
Operating lease, weighted average discount rate, percent 3.10%    
Accounts Payable and Accrued Liabilities      
Operating Leased Assets [Line Items]      
Operating lease, liability $ 186 200  
Other Liabilities      
Operating Leased Assets [Line Items]      
Operating lease, liability $ 628 $ 800