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Employee Benefit Plans - Summary of Balance Sheet Components (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Consolidated Balance Sheet for pension and other postretirement benefit plans    
Noncurrent employee benefit plans $ (4,111) $ (3,857)
Pension Benefits | U.S.    
Consolidated Balance Sheet for pension and other postretirement benefit plans    
Deferred charges and other assets 1,519 607
Accrued liabilities (367) (146)
Noncurrent employee benefit plans (1,095) (1,064)
Net amount recognized at December 31 57 (603)
Pension Benefits | Int’l.    
Consolidated Balance Sheet for pension and other postretirement benefit plans    
Deferred charges and other assets 832 655
Accrued liabilities (67) (71)
Noncurrent employee benefit plans (892) (812)
Net amount recognized at December 31 (127) (228)
Other Benefits    
Consolidated Balance Sheet for pension and other postretirement benefit plans    
Deferred charges and other assets 0 0
Accrued liabilities (162) (149)
Noncurrent employee benefit plans (1,819) (1,731)
Net amount recognized at December 31 $ (1,981) $ (1,880)