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Fair Value Measurements - Summary of Fair Value of Derivative Assets and Liabilities and Effect of Counterparty Netting (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Assets    
Total Fair Value of Gross Assets $ 1,256 $ 826
Effect of Counterparty Netting (1,048) (669)
Effect of Collateral Netting (8) 0
Difference in Carrying Value and Fair Value 0 0
Net Carrying Value Presented on the Balance Sheet 200 157
Liabilities    
Total Fair Value Gross Liabilities 17,680 18,265
Effect of Counterparty Netting (1,048) (669)
Effect of Collateral Netting (78) (46)
Difference in Carrying Value and Fair Value (1,391) (1,927)
Net Carrying Value Presented on the Balance Sheet 15,163 15,623
Level 1    
Assets    
Total Fair Value of Gross Assets 896 457
Liabilities    
Total Fair Value Gross Liabilities 794 351
Level 2    
Assets    
Total Fair Value of Gross Assets 360 369
Liabilities    
Total Fair Value Gross Liabilities 16,886 17,914
Level 3    
Assets    
Total Fair Value of Gross Assets 0 0
Liabilities    
Total Fair Value Gross Liabilities 0 0
Commodity Derivative Assets | Exchange-cleared instruments    
Assets    
Commodity Derivative Assets 1,083 670
Effect of Counterparty Netting (1,048) (669)
Effect of Collateral Netting (8) 0
Difference in Carrying Value and Fair Value 0 0
Net Carrying Value Presented on the Balance Sheet 27 1
Liabilities    
Commodity Derivative Liabilities 1,126 715
Effect of Counterparty Netting (1,048) (669)
Effect of Collateral Netting (78) (46)
Difference in Carrying Value and Fair Value 0 0
Net Carrying Value Presented on the Balance Sheet 0 0
Commodity Derivative Assets | OTC instruments    
Liabilities    
Commodity Derivative Liabilities 1  
Effect of Counterparty Netting 0  
Effect of Collateral Netting 0  
Difference in Carrying Value and Fair Value 0  
Net Carrying Value Presented on the Balance Sheet 1  
Commodity Derivative Assets | Physical forward contracts    
Assets    
Commodity Derivative Assets 23 13
Effect of Counterparty Netting 0 0
Effect of Collateral Netting 0 0
Difference in Carrying Value and Fair Value 0 0
Net Carrying Value Presented on the Balance Sheet 23 13
Liabilities    
Commodity Derivative Liabilities 13 10
Effect of Counterparty Netting 0 0
Effect of Collateral Netting 0 0
Difference in Carrying Value and Fair Value 0 0
Net Carrying Value Presented on the Balance Sheet 13 10
Commodity Derivative Assets | Level 1 | Exchange-cleared instruments    
Assets    
Commodity Derivative Assets 746 314
Liabilities    
Commodity Derivative Liabilities 794 351
Commodity Derivative Assets | Level 1 | OTC instruments    
Liabilities    
Commodity Derivative Liabilities 0  
Commodity Derivative Assets | Level 1 | Physical forward contracts    
Assets    
Commodity Derivative Assets 0 0
Liabilities    
Commodity Derivative Liabilities 0 0
Commodity Derivative Assets | Level 2 | Exchange-cleared instruments    
Assets    
Commodity Derivative Assets 337 356
Liabilities    
Commodity Derivative Liabilities 332 364
Commodity Derivative Assets | Level 2 | OTC instruments    
Liabilities    
Commodity Derivative Liabilities 1  
Commodity Derivative Assets | Level 2 | Physical forward contracts    
Assets    
Commodity Derivative Assets 23 13
Liabilities    
Commodity Derivative Liabilities 13 10
Commodity Derivative Assets | Level 3 | Exchange-cleared instruments    
Assets    
Commodity Derivative Assets 0 0
Liabilities    
Commodity Derivative Liabilities 0 0
Commodity Derivative Assets | Level 3 | OTC instruments    
Liabilities    
Commodity Derivative Liabilities 0  
Commodity Derivative Assets | Level 3 | Physical forward contracts    
Assets    
Commodity Derivative Assets 0 0
Liabilities    
Commodity Derivative Liabilities 0 0
Interest rate derivatives    
Liabilities    
Commodity Derivative Liabilities   3
Interest-rate derivatives 1  
Effect of Counterparty Netting 0 0
Effect of Collateral Netting 0 0
Difference in Carrying Value and Fair Value 0 0
Net Carrying Value Presented on the Balance Sheet 1 3
Interest rate derivatives | Level 1    
Liabilities    
Commodity Derivative Liabilities   0
Interest-rate derivatives 0  
Interest rate derivatives | Level 2    
Liabilities    
Commodity Derivative Liabilities   3
Interest-rate derivatives 1  
Interest rate derivatives | Level 3    
Liabilities    
Commodity Derivative Liabilities   0
Interest-rate derivatives 0  
Rabbi trust assets    
Assets    
Rabbi trust assets 150 143
Difference in Carrying Value and Fair Value 0 0
Rabbi trust assets | Level 1    
Assets    
Rabbi trust assets 150 143
Rabbi trust assets | Level 2    
Assets    
Rabbi trust assets 0 0
Rabbi trust assets | Level 3    
Assets    
Rabbi trust assets 0 0
Floating-rate debt    
Liabilities    
Debt 1,475 1,940
Difference in Carrying Value and Fair Value 0 0
Floating-rate debt | Net Carrying Value Presented on the Balance Sheet    
Liabilities    
Debt 1,475 1,940
Floating-rate debt | Level 1    
Liabilities    
Debt 0 0
Floating-rate debt | Level 2    
Liabilities    
Debt 1,475 1,940
Floating-rate debt | Level 3    
Liabilities    
Debt 0 0
Fixed-rate debt, excluding finance leases    
Liabilities    
Debt 15,064 15,597
Difference in Carrying Value and Fair Value (1,391) (1,927)
Fixed-rate debt, excluding finance leases | Net Carrying Value Presented on the Balance Sheet    
Liabilities    
Debt 13,673 13,670
Fixed-rate debt, excluding finance leases | Level 1    
Liabilities    
Debt 0 0
Fixed-rate debt, excluding finance leases | Level 2    
Liabilities    
Debt 15,064 15,597
Fixed-rate debt, excluding finance leases | Level 3    
Liabilities    
Debt $ 0 $ 0