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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, 2019
Dec. 31, 2018
Price Risk Derivative Assets, at Fair Value $ 679 $ 560
Other Assets, Fair Value Disclosure 29 26
Assets, Fair Value Disclosure 708 586
Interest Rate Derivative Liabilities, at Fair Value (528) (163)
Price Risk Derivative Liabilities, at Fair Value (597) (583)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (1,125) (746)
Level 1    
Price Risk Derivative Assets, at Fair Value 648 448
Other Assets, Fair Value Disclosure 19 17
Assets, Fair Value Disclosure 667 465
Interest Rate Derivative Liabilities, at Fair Value 0 0
Price Risk Derivative Liabilities, at Fair Value (572) (480)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (572) (480)
Level 2    
Price Risk Derivative Assets, at Fair Value 31 112
Other Assets, Fair Value Disclosure 10 9
Assets, Fair Value Disclosure 41 121
Interest Rate Derivative Liabilities, at Fair Value (528) (163)
Price Risk Derivative Liabilities, at Fair Value (25) (103)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (553) (266)
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member]    
Price Risk Derivative Assets, at Fair Value 27 42
Price Risk Derivative Liabilities, at Fair Value (54) (91)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member]    
Price Risk Derivative Assets, at Fair Value 5 52
Price Risk Derivative Liabilities, at Fair Value (9) (40)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member]    
Price Risk Derivative Assets, at Fair Value 44 97
Price Risk Derivative Liabilities, at Fair Value (29) (88)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 5 20
Price Risk Derivative Liabilities, at Fair Value (2) (21)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Basis Swaps IFERC/NYMEX [Member]    
Price Risk Derivative Assets, at Fair Value 27 42
Price Risk Derivative Liabilities, at Fair Value (54) (91)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Swing Swaps IFERC [Member]    
Price Risk Derivative Assets, at Fair Value 0 8
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 44 97
Price Risk Derivative Liabilities, at Fair Value (29) (88)
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 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 5 44
Price Risk Derivative Liabilities, at Fair Value (9) (40)
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 5 20
Price Risk Derivative Liabilities, at Fair Value (2) (21)
Commodity Derivatives - Refined Products [Member] | Future [Member]    
Price Risk Derivative Assets, at Fair Value 1 7
Price Risk Derivative Liabilities, at Fair Value (3) (15)
Commodity Derivatives - Refined Products [Member] | Level 1 | Future [Member]    
Price Risk Derivative Assets, at Fair Value 1 7
Price Risk Derivative Liabilities, at Fair Value (3) (15)
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 43  
Price Risk Derivative Liabilities, at Fair Value (1)  
Commodity Derivatives - Crude [Member] | Forwards Swaps [Member]    
Price Risk Derivative Assets, at Fair Value   1
Price Risk Derivative Liabilities, at Fair Value   (61)
Commodity Derivatives - Crude [Member] | Level 1 | Future [Member]    
Price Risk Derivative Assets, at Fair Value 43  
Price Risk Derivative Liabilities, at Fair Value (1)  
Commodity Derivatives - Crude [Member] | Level 1 | Forwards Swaps [Member]    
Price Risk Derivative Assets, at Fair Value   1
Price Risk Derivative Liabilities, at Fair Value   (61)
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
Price Risk Derivative Liabilities, at Fair Value   0
Commodity Derivatives - Power [Member] | Forward Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 21 48
Price Risk Derivative Liabilities, at Fair Value (14) (42)
Commodity Derivatives - Power [Member] | Call Option [Member]    
Price Risk Derivative Assets, at Fair Value   1
Price Risk Derivative Liabilities, at Fair Value 1  
Commodity Derivatives - Power [Member] | Future [Member]    
Price Risk Derivative Assets, at Fair Value 4 1
Price Risk Derivative Liabilities, at Fair Value (5) (1)
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 Assets, at Fair Value   1
Price Risk Derivative Liabilities, at Fair Value (1)  
Commodity Derivatives - Power [Member] | Level 1 | Future [Member]    
Price Risk Derivative Assets, at Fair Value 4 1
Price Risk Derivative Liabilities, at Fair Value (5) (1)
Commodity Derivatives - Power [Member] | Level 2 | Forward Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 21 48
Price Risk Derivative Liabilities, at Fair Value (14) (42)
Commodity Derivatives - Power [Member] | Level 2 | Call Option [Member]    
Price Risk Derivative Assets, at Fair Value   0
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 529 291
Price Risk Derivative Liabilities, at Fair Value (479) (224)
Commodity Derivatives - NGLs [Member] | Level 1 | Forward Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 529 291
Price Risk Derivative Liabilities, at Fair Value (479) (224)
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