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Fair Value Measurements Table - Fair Value of Financial Assets and Liabilities (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Price Risk Derivative Assets, at Fair Value $ 541 $ 560
Other Assets, Fair Value Disclosure 29 26
Assets, Fair Value Disclosure 570 586
Interest Rate Derivative Liabilities, at Fair Value (354) (163)
Price Risk Derivative Liabilities, at Fair Value (523) (583)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (877) (746)
Level 1    
Price Risk Derivative Assets, at Fair Value 494 448
Other Assets, Fair Value Disclosure 19 17
Assets, Fair Value Disclosure 513 465
Interest Rate Derivative Liabilities, at Fair Value 0 0
Price Risk Derivative Liabilities, at Fair Value (488) (480)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (488) (480)
Level 2    
Price Risk Derivative Assets, at Fair Value 47 112
Other Assets, Fair Value Disclosure 10 9
Assets, Fair Value Disclosure 57 121
Interest Rate Derivative Liabilities, at Fair Value (354) (163)
Price Risk Derivative Liabilities, at Fair Value (35) (103)
Financial and Nonfinancial Liabilities, Fair Value Disclosure (389) (266)
Commodity Derivatives - Natural Gas [Member] | Basis Swaps IFERC/NYMEX [Member]    
Price Risk Derivative Assets, at Fair Value 33 42
Price Risk Derivative Liabilities, at Fair Value (42) (91)
Commodity Derivatives - Natural Gas [Member] | Swing Swaps IFERC [Member]    
Price Risk Derivative Assets, at Fair Value   52
Price Risk Derivative Liabilities, at Fair Value (2) (40)
Commodity Derivatives - Natural Gas [Member] | Fixed Swaps/Futures [Member]    
Price Risk Derivative Assets, at Fair Value 35 97
Price Risk Derivative Liabilities, at Fair Value (23) (88)
Commodity Derivatives - Natural Gas [Member] | Forward Physical Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 7 20
Price Risk Derivative Liabilities, at Fair Value (3) (21)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Basis Swaps IFERC/NYMEX [Member]    
Price Risk Derivative Assets, at Fair Value 33 42
Price Risk Derivative Liabilities, at Fair Value (42) (91)
Commodity Derivatives - Natural Gas [Member] | Level 1 | Swing Swaps IFERC [Member]    
Price Risk Derivative Assets, at Fair Value   8
Price Risk Derivative Liabilities, at Fair Value (1) 0
Commodity Derivatives - Natural Gas [Member] | Level 1 | Fixed Swaps/Futures [Member]    
Price Risk Derivative Assets, at Fair Value 35 97
Price Risk Derivative Liabilities, at Fair Value (23) (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   44
Price Risk Derivative Liabilities, at Fair Value (1) (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 7 20
Price Risk Derivative Liabilities, at Fair Value (3) (21)
Commodity Derivatives - Refined Products [Member] | Future [Member]    
Price Risk Derivative Assets, at Fair Value 1 7
Price Risk Derivative Liabilities, at Fair Value (4) (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 (4) (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 40  
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 40  
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
Corn [Member] | Future [Member]    
Price Risk Derivative Assets, at Fair Value 1  
Corn [Member] | Level 1 | Future [Member]    
Price Risk Derivative Assets, at Fair Value 1  
Corn [Member] | Level 2 | Future [Member]    
Price Risk Derivative Assets, at Fair Value 0  
Commodity Derivatives - Power [Member] | Forward Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 40 48
Price Risk Derivative Liabilities, at Fair Value (31) (42)
Commodity Derivatives - Power [Member] | Call Option [Member]    
Price Risk Derivative Assets, at Fair Value   1
Commodity Derivatives - Power [Member] | Future [Member]    
Price Risk Derivative Assets, at Fair Value 7 1
Price Risk Derivative Liabilities, at Fair Value (8) (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
Commodity Derivatives - Power [Member] | Level 1 | Future [Member]    
Price Risk Derivative Assets, at Fair Value 7 1
Price Risk Derivative Liabilities, at Fair Value (8) (1)
Commodity Derivatives - Power [Member] | Level 2 | Forward Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 40 48
Price Risk Derivative Liabilities, at Fair Value (31) (42)
Commodity Derivatives - Power [Member] | Level 2 | Call Option [Member]    
Price Risk Derivative Assets, 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 377 291
Price Risk Derivative Liabilities, at Fair Value (409) (224)
Commodity Derivatives - NGLs [Member] | Level 1 | Forward Swaps [Member]    
Price Risk Derivative Assets, at Fair Value 377 291
Price Risk Derivative Liabilities, at Fair Value (409) (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