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Gains and Losses on Divestitures, Impairments and Other Write-downs (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Pre-tax losses (gains) on divestitures, impairments and other write-downs, net   $ 52 $ (32) $ 1,535
Impairments of long-lived assets       $ 1,634
Impairment of long-lived assets (Extensible)       Gain (Loss) on Sale of Assets and Asset Impairment Charges
Gain on sale of interest in equity investment   0 0 $ (206)
Natural Gas Pipelines        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Impairments of long-lived assets   0 0 1,600
(Gains) losses on divestitures of long-lived assets   (10) (10) (1)
Products Pipelines        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
(Gains) losses on divestitures of long-lived assets   0 (12) 0
Terminals        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Impairments of long-lived assets   0 0 34
(Gains) losses on divestitures of long-lived assets   (1) (9) 2
CO2        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
(Gains) losses on divestitures of long-lived assets   (1) (1) (8)
Other        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
(Gains) losses on divestitures of long-lived assets   (3) 0 (3)
NGPL Holdings | Natural Gas Pipelines        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Gain on sale of interest in equity investment   0 0 (206)
Ruby Pipeline Holding Company LLC | Natural Gas Pipelines | Notes Receivable        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Impairments of equity investments $ 117 0 0 117
Double Eagle Pipeline LLC        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Impairments of equity investments   67    
Double Eagle Pipeline LLC | Products Pipelines        
Impairment of Goodwill, Long-lived assets and equity investments [Line Items]        
Impairments of equity investments   $ 67 $ 0 $ 0