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Fair Value Measurements Table - Fair Value of Financial Assets and Liabilities (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Price Risk Derivative Assets, at Fair Value $ 502 $ 272
Other Assets, Fair Value Disclosure 37 39
Assets, Fair Value Disclosure 539 311
Interest Rate Derivative Liabilities, at Fair Value (273) (387)
Price Risk Derivative Liabilities, at Fair Value (511) (211)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (784) (598)
Level 1    
Price Risk Derivative Assets, at Fair Value 443 248
Other Assets, Fair Value Disclosure 24 26
Assets, Fair Value Disclosure 467 274
Interest Rate Derivative Liabilities, at Fair Value 0 0
Price Risk Derivative Liabilities, at Fair Value (474) (190)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (474) (190)
Level 2    
Price Risk Derivative Assets, at Fair Value 59 24
Other Assets, Fair Value Disclosure 13 13
Assets, Fair Value Disclosure 72 37
Interest Rate Derivative Liabilities, at Fair Value (273) (387)
Price Risk Derivative Liabilities, at Fair Value (37) (21)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (310) (408)
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member]    
Price Risk Derivative Assets, at Fair Value 4 7
Price Risk Derivative Liabilities, at Fair Value (3) (10)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member]    
Price Risk Derivative Assets, at Fair Value 2 38
Price Risk Derivative Liabilities, at Fair Value (8) (6)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member]    
Price Risk Derivative Assets, at Fair Value 2 26
Price Risk Derivative Liabilities, at Fair Value (64) (9)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 7 7
Commodity Derivatives - Natural Gas [Member] | Forward Physical Contracts [Member]    
Price Risk Derivative Liabilities, at Fair Value   (6)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Basis Swaps IFERC/NYMEX [Member]    
Price Risk Derivative Assets, at Fair Value 4 7
Price Risk Derivative Liabilities, at Fair Value (3) (10)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Swing Swaps IFERC [Member]    
Price Risk Derivative Assets, at Fair Value 2 38
Price Risk Derivative Liabilities, at Fair Value (8) (6)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Fixed Swaps/Futures [Member]    
Price Risk Derivative Assets, at Fair Value 2 26
Price Risk Derivative Liabilities, at Fair Value (64) (9)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Forward Physical Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 0 0
Commodity Derivatives - Natural Gas [Member] | Level 1 | Forward Physical Contracts [Member]    
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 Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 7 7
Commodity Derivatives - Natural Gas [Member] | Level 2 | Forward Physical Contracts [Member]    
Price Risk Derivative Liabilities, at Fair Value   (6)
Commodity Derivatives - Refined Products [Member] | Future [Member]    
Price Risk Derivative Assets, at Fair Value 23 3
Price Risk Derivative Liabilities, at Fair Value (1) (18)
Commodity Derivatives - Refined Products [Member] | Level 1 | Future [Member]    
Price Risk Derivative Assets, at Fair Value 23 3
Price Risk Derivative Liabilities, at Fair Value (1) (18)
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 Liabilities, at Fair Value   (3)
Commodity Derivatives - Crude [Member] | Future [Member]    
Price Risk Derivative Assets, at Fair Value 20  
Price Risk Derivative Liabilities, at Fair Value (19)  
Commodity Derivatives - Crude [Member] | Forwards Swaps [Member]    
Price Risk Derivative Assets, at Fair Value   16
Commodity Derivatives - Crude [Member] | Level 1 | Forward Swaps [Member]    
Price Risk Derivative Liabilities, at Fair Value   (3)
Commodity Derivatives - Crude [Member] | Level 1 | Future [Member]    
Price Risk Derivative Assets, at Fair Value 20  
Price Risk Derivative Liabilities, at Fair Value (19)  
Commodity Derivatives - Crude [Member] | Level 1 | Forwards Swaps [Member]    
Price Risk Derivative Assets, at Fair Value   16
Commodity Derivatives - Crude [Member] | Level 2 | Forward Swaps [Member]    
Price Risk Derivative Liabilities, at Fair Value   0
Commodity Derivatives - Crude [Member] | Level 2 | Future [Member]    
Price Risk Derivative Assets, at Fair Value 0  
Price Risk Derivative Liabilities, at Fair Value 0  
Commodity Derivatives - Crude [Member] | Level 2 | Forwards Swaps [Member]    
Price Risk Derivative Assets, at Fair Value   0
Commodity Derivatives - Power [Member] | Forward Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 52 17
Price Risk Derivative Liabilities, at Fair Value (37) (15)
Commodity Derivatives - Power [Member] | Call Option [Member]    
Price Risk Derivative Liabilities, at Fair Value (1)  
Commodity Derivatives - Power [Member] | Future [Member]    
Price Risk Derivative Assets, at Fair Value 9 6
Price Risk Derivative Liabilities, at Fair Value (19) (4)
Commodity Derivatives - Power [Member] | Level 1 | 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] | Level 1 | Call Option [Member]    
Price Risk Derivative Liabilities, at Fair Value (1)  
Commodity Derivatives - Power [Member] | Level 1 | Future [Member]    
Price Risk Derivative Assets, at Fair Value 9 6
Price Risk Derivative Liabilities, at Fair Value (19) (4)
Commodity Derivatives - Power [Member] | Level 2 | Forward Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 52 17
Price Risk Derivative Liabilities, at Fair Value (37) (15)
Commodity Derivatives - Power [Member] | Level 2 | Call Option [Member]    
Price Risk Derivative Liabilities, at Fair Value 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 - NGLs [Member] | Forward Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 383 152
Price Risk Derivative Liabilities, at Fair Value (359) (140)
Commodity Derivatives - NGLs [Member] | Level 1 | Forward Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 383 152
Price Risk Derivative Liabilities, at Fair Value (359) (140)
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