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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, 2019
Dec. 31, 2018
Commodity derivatives: $ 384 $ 560
Other Assets, Fair Value Disclosure 31 26
Total assets 415 586
Interest rate derivatives (399) (163)
Commodity derivatives: (389) (583)
Financial and Nonfinancial Liabilities, Fair Value Disclosure 788 746
Level 1 [Member]    
Commodity derivatives: 369 448
Other Assets, Fair Value Disclosure 20 17
Total assets 389 465
Interest rate derivatives 0 0
Commodity derivatives: (383) (480)
Financial and Nonfinancial Liabilities, Fair Value Disclosure 383 480
Level 2 [Member]    
Commodity derivatives: 15 112
Other Assets, Fair Value Disclosure 11 9
Total assets 26 121
Interest rate derivatives (399) (163)
Commodity derivatives: (6) (103)
Financial and Nonfinancial Liabilities, Fair Value Disclosure 405 266
Commodity Derivatives - Power [Member] | Options - Calls [Member]    
Commodity derivatives: 1 1
Commodity Derivatives - Power [Member] | Forwards Swaps [Member]    
Commodity derivatives: 11 48
Commodity derivatives: (5) (42)
Commodity Derivatives - Power [Member] | Future [Member]    
Commodity derivatives: 4 1
Commodity derivatives: (3) (1)
Commodity Derivatives - Power [Member] | Options - Puts [Member]    
Commodity derivatives: 1  
Commodity Derivatives - Power [Member] | Level 1 [Member] | Options - Calls [Member]    
Commodity derivatives: 1 1
Commodity Derivatives - Power [Member] | Level 1 [Member] | Forwards Swaps [Member]    
Commodity derivatives: 0 0
Commodity derivatives: 0 0
Commodity Derivatives - Power [Member] | Level 1 [Member] | Future [Member]    
Commodity derivatives: 4 1
Commodity derivatives: (3) (1)
Commodity Derivatives - Power [Member] | Level 1 [Member] | Options - Puts [Member]    
Commodity derivatives: 1  
Commodity Derivatives - Power [Member] | Level 2 [Member] | Options - Calls [Member]    
Commodity derivatives: 0 0
Commodity Derivatives - Power [Member] | Level 2 [Member] | Forwards Swaps [Member]    
Commodity derivatives: 11 48
Commodity derivatives: (5) (42)
Commodity Derivatives - Power [Member] | Level 2 [Member] | Future [Member]    
Commodity derivatives: 0 0
Commodity derivatives: 0 0
Commodity Derivatives - Power [Member] | Level 2 [Member] | Options - Puts [Member]    
Commodity derivatives: 0  
Commodity Derivatives - Refined Products [Member] | Future [Member]    
Commodity derivatives: 8 7
Commodity derivatives: (10) (15)
Commodity Derivatives - Refined Products [Member] | Level 1 [Member] | Future [Member]    
Commodity derivatives: 8 7
Commodity derivatives: (10) (15)
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: 13 1
Commodity Derivatives - Crude [Member] | Future [Member]    
Commodity derivatives:   (61)
Commodity Derivatives - Crude [Member] | Level 1 [Member] | Forwards Swaps [Member]    
Commodity derivatives: 13 1
Commodity Derivatives - Crude [Member] | Level 1 [Member] | Future [Member]    
Commodity derivatives:   (61)
Commodity Derivatives - Crude [Member] | Level 2 [Member] | Forwards Swaps [Member]    
Commodity derivatives: 0 0
Commodity Derivatives - Crude [Member] | Level 2 [Member] | Future [Member]    
Commodity derivatives:   0
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC NYMEX [Member]    
Commodity derivatives: 17 42
Commodity derivatives: (49) (91)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member]    
Commodity derivatives: 1 52
Commodity derivatives: (1) (40)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member]    
Commodity derivatives: 65 97
Commodity derivatives: (43) (88)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Contracts [Member]    
Commodity derivatives:   (21)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member]    
Commodity derivatives: 3 20
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Basis Swaps IFERC NYMEX [Member]    
Commodity derivatives: 17 42
Commodity derivatives: (49) (91)
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Swing Swaps IFERC [Member]    
Commodity derivatives: 0 8
Commodity derivatives: 0 0
Commodity Derivatives - Natural Gas [Member] | Level 1 [Member] | Fixed Swaps/Futures [Member]    
Commodity derivatives: 65 97
Commodity derivatives: (43) (88)
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 2 [Member] | Basis Swaps IFERC NYMEX [Member]    
Commodity derivatives: 0 0
Commodity derivatives: 0 0
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Swing Swaps IFERC [Member]    
Commodity derivatives: 1 44
Commodity derivatives: (1) (40)
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:   (21)
Commodity Derivatives - Natural Gas [Member] | Level 2 [Member] | Forward Physical Swaps [Member]    
Commodity derivatives: 3 20
Commodity Derivatives - NGLs [Member] | Forwards Swaps [Member]    
Commodity derivatives: 260 291
Commodity derivatives: (278) (224)
Commodity Derivatives - NGLs [Member] | Level 1 [Member] | Forwards Swaps [Member]    
Commodity derivatives: 260 291
Commodity derivatives: (278) (224)
Commodity Derivatives - NGLs [Member] | Level 2 [Member] | Forwards Swaps [Member]    
Commodity derivatives: 0 0
Commodity derivatives: $ 0 $ 0