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Estimates (Fair Value Of Financial Assets And Liabilities Measured On Recurring Basis) (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Commodity derivatives: $ 610 $ 688
Other Assets, Fair Value Disclosure 31 27
Total assets 647 715
Interest rate derivatives (4) (23)
Commodity derivatives: (460) (526)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (464) (549)
Interest Rate Derivative Assets, at Fair Value 6 0
Level 1 [Member]    
Commodity derivatives: 602 626
Other Assets, Fair Value Disclosure 20 18
Total assets 622 644
Interest rate derivatives 0 0
Commodity derivatives: (460) (473)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (460) (473)
Interest Rate Derivative Assets, at Fair Value 0 0
Level 2 [Member]    
Commodity derivatives: 8 62
Other Assets, Fair Value Disclosure 11 9
Total assets 25 71
Interest rate derivatives (4) (23)
Commodity derivatives: 0 (53)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (4) (76)
Interest Rate Derivative Assets, at Fair Value 6 0
Commodity Derivatives - Power [Member] | Forwards Swaps [Member]    
Commodity derivatives: 57 52
Commodity derivatives: (56) (51)
Commodity Derivatives - Power [Member] | Future [Member]    
Commodity derivatives: 8 3
Commodity derivatives: (8) (3)
Commodity Derivatives - Power [Member] | Level 1 [Member] | Forwards Swaps [Member]    
Commodity derivatives: 57 0
Commodity derivatives: (56)
Commodity Derivatives - Power [Member] | Level 1 [Member] | Future [Member]    
Commodity derivatives: 8 3
Commodity derivatives: (8) (3)
Commodity Derivatives - Power [Member] | Level 2 [Member] | Forwards Swaps [Member]    
Commodity derivatives: 0 52
Commodity derivatives: 0 (51)
Commodity Derivatives - Power [Member] | Level 2 [Member] | Future [Member]    
Commodity derivatives: 0 0
Commodity derivatives: 0 0
Commodity Derivatives - Refined Products [Member] | Future [Member]    
Commodity derivatives: 35 20
Commodity derivatives: (18) (59)
Commodity Derivatives - Refined Products [Member] | Level 1 [Member] | Future [Member]    
Commodity derivatives: 35 20
Commodity derivatives: (18) (59)
Commodity Derivatives - Refined Products [Member] | Level 2 [Member] | Future [Member]    
Commodity derivatives: 0 0
Commodity derivatives: 0 0
Commodity Derivatives - Crude [Member] | Forwards Swaps [Member]    
Commodity derivatives: 45 38
Commodity derivatives: (37) (12)
Commodity Derivatives - Crude [Member] | Level 1 [Member] | Forwards Swaps [Member]    
Commodity derivatives: 45 38
Commodity derivatives: (37) (12)
Commodity Derivatives - Crude [Member] | Level 2 [Member] | Forwards Swaps [Member]    
Commodity derivatives: 0 0
Commodity derivatives: 0 0
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC NYMEX [Member]    
Commodity derivatives: 24 60
Commodity derivatives: (3) (25)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member]    
Commodity derivatives: 20 75
Commodity derivatives: (2) (12)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member]    
Commodity derivatives: 77 113
Commodity derivatives: (16) (4)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Contracts [Member]    
Commodity derivatives:   (2)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member]    
Commodity derivatives: 8 10
Commodity Derivatives - Natural Gas [Member] | Put Option [Member]    
Commodity derivatives: (2)  
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Basis Swaps IFERC NYMEX [Member]    
Commodity derivatives: 24 60
Commodity derivatives: (3) (25)
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Swing Swaps IFERC [Member]    
Commodity derivatives: 20 75
Commodity derivatives: (2) (12)
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Fixed Swaps/Futures [Member]    
Commodity derivatives: 77 113
Commodity derivatives: (16) (4)
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Forward Physical Contracts [Member]    
Commodity derivatives:   0
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Forward Physical Swaps [Member]    
Commodity derivatives: 0 0
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Put Option [Member]    
Commodity derivatives: (2)  
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Basis Swaps IFERC NYMEX [Member]    
Commodity derivatives: 0 0
Commodity derivatives: 0
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Swing Swaps IFERC [Member]    
Commodity derivatives: 0 0
Commodity derivatives: 0 0
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Fixed Swaps/Futures [Member]    
Commodity derivatives: 0 0
Commodity derivatives: 0 0
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Forward Physical Contracts [Member]    
Commodity derivatives:   (2)
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Forward Physical Swaps [Member]    
Commodity derivatives: 8 10
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Put Option [Member]    
Commodity derivatives: 0  
Commodity Derivatives - NGLs [Member] | Forwards Swaps [Member]    
Commodity derivatives: 336 317
Commodity derivatives: (316) (358)
Commodity Derivatives - NGLs [Member] | Put Option [Member]    
Commodity derivatives: (1)  
Commodity Derivatives - NGLs [Member] | Options - Calls [Member]    
Commodity derivatives: (1)  
Commodity Derivatives - NGLs [Member] | Level 1 [Member] | Forwards Swaps [Member]    
Commodity derivatives: 336 317
Commodity derivatives: (316) (358)
Commodity Derivatives - NGLs [Member] | Level 1 [Member] | Put Option [Member]    
Commodity derivatives: (1)  
Commodity Derivatives - NGLs [Member] | Level 1 [Member] | Options - Calls [Member]    
Commodity derivatives: (1)  
Commodity Derivatives - NGLs [Member] | Level 2 [Member] | Forwards Swaps [Member]    
Commodity derivatives: 0 0
Commodity derivatives: 0 $ 0
Commodity Derivatives - NGLs [Member] | Level 2 [Member] | Put Option [Member]    
Commodity derivatives: 0  
Commodity Derivatives - NGLs [Member] | Level 2 [Member] | Options - Calls [Member]    
Commodity derivatives: $ 0