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Fair Value Measurements Table - Fair Value of Financial Assets and Liabilities (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Price Risk Derivative Assets, at Fair Value $ 405 $ 688
Other Assets, Fair Value Disclosure 28 27
Assets, Fair Value Disclosure 447 715
Interest Rate Derivative Liabilities, at Fair Value   (23)
Price Risk Derivative Liabilities, at Fair Value (449) (526)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (449) (549)
Interest Rate Derivative Assets, at Fair Value 14  
Level 1    
Price Risk Derivative Assets, at Fair Value 356 626
Other Assets, Fair Value Disclosure 18 18
Assets, Fair Value Disclosure 374 644
Interest Rate Derivative Liabilities, at Fair Value   0
Price Risk Derivative Liabilities, at Fair Value (404) (473)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (404) (473)
Interest Rate Derivative Assets, at Fair Value 0  
Level 2    
Price Risk Derivative Assets, at Fair Value 49 62
Other Assets, Fair Value Disclosure 10 9
Assets, Fair Value Disclosure 73 71
Interest Rate Derivative Liabilities, at Fair Value   (23)
Price Risk Derivative Liabilities, at Fair Value (45) (53)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (45) (76)
Interest Rate Derivative Assets, at Fair Value 14  
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member]    
Price Risk Derivative Assets, at Fair Value 3 60
Price Risk Derivative Liabilities, at Fair Value (10) (25)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member]    
Price Risk Derivative Assets, at Fair Value 4 75
Price Risk Derivative Liabilities, at Fair Value (5) (12)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member]    
Price Risk Derivative Assets, at Fair Value 28 113
Price Risk Derivative Liabilities, at Fair Value (2) (4)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Contracts [Member]    
Price Risk Derivative Assets, at Fair Value 3 10
Price Risk Derivative Liabilities, at Fair Value   (2)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Basis Swaps IFERC/NYMEX [Member]    
Price Risk Derivative Assets, at Fair Value 3 60
Price Risk Derivative Liabilities, at Fair Value (10) (25)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Swing Swaps IFERC [Member]    
Price Risk Derivative Assets, at Fair Value 4 75
Price Risk Derivative Liabilities, at Fair Value (5) (12)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Fixed Swaps/Futures [Member]    
Price Risk Derivative Assets, at Fair Value 28 113
Price Risk Derivative Liabilities, at Fair Value (2) (4)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Forward Physical Contracts [Member]    
Price Risk Derivative Assets, at Fair Value 0 0
Price Risk Derivative Liabilities, at Fair Value   0
Commodity Derivatives - Natural Gas [Member] | Level 2 | Basis Swaps IFERC/NYMEX [Member]    
Price Risk Derivative Assets, at Fair Value 0 0
Price Risk Derivative Liabilities, at Fair Value 0 0
Commodity Derivatives - Natural Gas [Member] | Level 2 | Swing Swaps IFERC [Member]    
Price Risk Derivative Assets, at Fair Value 0 0
Price Risk Derivative Liabilities, at Fair Value 0 0
Commodity Derivatives - Natural Gas [Member] | Level 2 | Fixed Swaps/Futures [Member]    
Price Risk Derivative Assets, at Fair Value 0 0
Price Risk Derivative Liabilities, at Fair Value 0 0
Commodity Derivatives - Natural Gas [Member] | Level 2 | Forward Physical Contracts [Member]    
Price Risk Derivative Assets, at Fair Value 3 10
Price Risk Derivative Liabilities, at Fair Value   (2)
Commodity Derivatives - Refined Products [Member] | Future [Member]    
Price Risk Derivative Assets, at Fair Value 27 20
Price Risk Derivative Liabilities, at Fair Value (35) (59)
Commodity Derivatives - Refined Products [Member] | Level 1 | Future [Member]    
Price Risk Derivative Assets, at Fair Value 27 20
Price Risk Derivative Liabilities, at Fair Value (35) (59)
Commodity Derivatives - Refined Products [Member] | Level 2 | Future [Member]    
Price Risk Derivative Assets, at Fair Value 0 0
Price Risk Derivative Liabilities, at Fair Value 0 0
Commodity Derivatives - Crude [Member] | Forward Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 32 38
Price Risk Derivative Liabilities, at Fair Value (41) (12)
Commodity Derivatives - Crude [Member] | Level 1 | Forward Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 32 38
Price Risk Derivative Liabilities, at Fair Value (41) (12)
Commodity Derivatives - Crude [Member] | Level 2 | Forward Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 0 0
Price Risk Derivative Liabilities, at Fair Value 0 0
Commodity Derivatives - Power [Member] | Future [Member]    
Price Risk Derivative Assets, at Fair Value 6 3
Price Risk Derivative Liabilities, at Fair Value (5) (3)
Commodity Derivatives - Power [Member] | Forward Contracts    
Price Risk Derivative Assets, at Fair Value 46 52
Price Risk Derivative Liabilities, at Fair Value (45) (51)
Commodity Derivatives - Power [Member] | Level 1 | Future [Member]    
Price Risk Derivative Assets, at Fair Value 6 3
Price Risk Derivative Liabilities, at Fair Value (5) (3)
Commodity Derivatives - Power [Member] | Level 1 | Forward Contracts    
Price Risk Derivative Assets, at Fair Value 0 0
Price Risk Derivative Liabilities, at Fair Value 0 0
Commodity Derivatives - Power [Member] | Level 2 | Future [Member]    
Price Risk Derivative Assets, at Fair Value 0 0
Price Risk Derivative Liabilities, at Fair Value 0 0
Commodity Derivatives - Power [Member] | Level 2 | Forward Contracts    
Price Risk Derivative Assets, at Fair Value 46 52
Price Risk Derivative Liabilities, at Fair Value (45) (51)
Commodity Derivatives - NGLs [Member] | Forward Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 256 317
Price Risk Derivative Liabilities, at Fair Value (306) (358)
Commodity Derivatives - NGLs [Member] | Level 1 | Forward Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 256 317
Price Risk Derivative Liabilities, at Fair Value (306) (358)
Commodity Derivatives - NGLs [Member] | Level 2 | Forward Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 0 0
Price Risk Derivative Liabilities, at Fair Value $ 0 $ 0