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Fair Value Measurements Table - Fair Value of Financial Assets and Liabilities (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Price Risk Derivative Assets, at Fair Value $ 455 $ 384
Other Assets, Fair Value Disclosure 29 31
Assets, Fair Value Disclosure 484 415
Interest Rate Derivative Liabilities, at Fair Value (577) (399)
Price Risk Derivative Liabilities, at Fair Value (466) (389)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (1,043) (788)
Level 1    
Price Risk Derivative Assets, at Fair Value 425 369
Other Assets, Fair Value Disclosure 19 20
Assets, Fair Value Disclosure 444 389
Interest Rate Derivative Liabilities, at Fair Value 0 0
Price Risk Derivative Liabilities, at Fair Value (443) (383)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (443) (383)
Level 2    
Price Risk Derivative Assets, at Fair Value 30 15
Other Assets, Fair Value Disclosure 10 11
Assets, Fair Value Disclosure 40 26
Interest Rate Derivative Liabilities, at Fair Value (577) (399)
Price Risk Derivative Liabilities, at Fair Value (23) (6)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (600) (405)
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member]    
Price Risk Derivative Assets, at Fair Value 112 17
Price Risk Derivative Liabilities, at Fair Value (83) (49)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member]    
Price Risk Derivative Assets, at Fair Value 2 1
Price Risk Derivative Liabilities, at Fair Value (5) (1)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member]    
Price Risk Derivative Assets, at Fair Value 93 65
Price Risk Derivative Liabilities, at Fair Value (117) (43)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 7 3
Price Risk Derivative Liabilities, at Fair Value (1)  
Commodity Derivatives - Natural Gas [Member] | Level 1 | Basis Swaps IFERC/NYMEX [Member]    
Price Risk Derivative Assets, at Fair Value 112 17
Price Risk Derivative Liabilities, at Fair Value (83) (49)
Commodity Derivatives - Natural Gas [Member] | Level 1 | 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 1 | Fixed Swaps/Futures [Member]    
Price Risk Derivative Assets, at Fair Value 93 65
Price Risk Derivative Liabilities, at Fair Value (117) (43)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Forward Physical Swaps [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 2 1
Price Risk Derivative Liabilities, at Fair Value (5) (1)
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 3
Price Risk Derivative Liabilities, at Fair Value (1)  
Commodity Derivatives - Refined Products [Member] | Future [Member]    
Price Risk Derivative Assets, at Fair Value 4 8
Price Risk Derivative Liabilities, at Fair Value (21) (10)
Commodity Derivatives - Refined Products [Member] | Level 1 | Future [Member]    
Price Risk Derivative Assets, at Fair Value 4 8
Price Risk Derivative Liabilities, at Fair Value (21) (10)
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] | Future [Member]    
Price Risk Derivative Assets, at Fair Value 3  
Price Risk Derivative Liabilities, at Fair Value (1)  
Commodity Derivatives - Crude [Member] | Forwards Swaps [Member]    
Price Risk Derivative Assets, at Fair Value   13
Commodity Derivatives - Crude [Member] | Level 1 | Future [Member]    
Price Risk Derivative Assets, at Fair Value 3  
Price Risk Derivative Liabilities, at Fair Value (1)  
Commodity Derivatives - Crude [Member] | Level 1 | Forwards Swaps [Member]    
Price Risk Derivative Assets, at Fair Value   13
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 21 11
Price Risk Derivative Liabilities, at Fair Value (17) (5)
Commodity Derivatives - Power [Member] | Put Option [Member]    
Price Risk Derivative Assets, at Fair Value 1 1
Commodity Derivatives - Power [Member] | Call Option [Member]    
Price Risk Derivative Assets, at Fair Value 1 1
Commodity Derivatives - Power [Member] | Future [Member]    
Price Risk Derivative Assets, at Fair Value 3 4
Price Risk Derivative Liabilities, at Fair Value (3) (3)
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 | Put Option [Member]    
Price Risk Derivative Assets, at Fair Value 1 1
Commodity Derivatives - Power [Member] | Level 1 | Call Option [Member]    
Price Risk Derivative Assets, at Fair Value 1 1
Commodity Derivatives - Power [Member] | Level 1 | Future [Member]    
Price Risk Derivative Assets, at Fair Value 3 4
Price Risk Derivative Liabilities, at Fair Value (3) (3)
Commodity Derivatives - Power [Member] | Level 2 | Forward Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 21 11
Price Risk Derivative Liabilities, at Fair Value (17) (5)
Commodity Derivatives - Power [Member] | Level 2 | Put Option [Member]    
Price Risk Derivative Assets, at Fair Value 0 0
Commodity Derivatives - Power [Member] | Level 2 | Call Option [Member]    
Price Risk Derivative Assets, 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 - NGLs [Member] | Forward Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 208 260
Price Risk Derivative Liabilities, at Fair Value (218) (278)
Commodity Derivatives - NGLs [Member] | Level 1 | Forward Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 208 260
Price Risk Derivative Liabilities, at Fair Value (218) (278)
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