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Employee Benefit Plans - Summary of Balance Sheet Components (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Consolidated Balance Sheet for pension and other postretirement benefit plans    
Noncurrent employee benefit plans $ (9,217) $ (7,866)
Pension Benefits | U.S.    
Consolidated Balance Sheet for pension and other postretirement benefit plans    
Deferred charges and other assets 24 23
Accrued liabilities (258) (239)
Noncurrent employee benefit plans (5,002) (4,072)
Net amount recognized at December 31 (5,236) (4,288)
Pension Benefits | Int’l.    
Consolidated Balance Sheet for pension and other postretirement benefit plans    
Deferred charges and other assets 547 413
Accrued liabilities (76) (71)
Noncurrent employee benefit plans (1,415) (1,231)
Net amount recognized at December 31 (944) (889)
Other Benefits    
Consolidated Balance Sheet for pension and other postretirement benefit plans    
Deferred charges and other assets 0 0
Accrued liabilities (153) (174)
Noncurrent employee benefit plans (2,497) (2,346)
Net amount recognized at December 31 $ (2,650) $ (2,520)