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Derivatives and Financial Instruments (Summary of Commodity Balance Sheet) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Assets    
Liabilities $ (849) $ (1,188)
Effect of Collateral Netting (20) 0
Liabilities    
Assets 849 1,188
Effect of Collateral Netting 20 80
Total    
Effect of Collateral Netting 20 80
Not Designated as Hedging Instrument | Commodity    
Liabilities    
Effect of Collateral Netting 0 80
Total    
Assets 957 1,214
Liabilities (879) (1,282)
Effect of Collateral Netting 0 80
Net Carrying Value Presented on the Balance Sheet 78 12
Not Designated as Hedging Instrument | Commodity | Prepaid expenses and other current assets    
Assets    
Assets 838 23
Liabilities (730) 0
Effect of Collateral Netting (20) 0
Net Carrying Value Presented on the Balance Sheet 88 23
Not Designated as Hedging Instrument | Commodity | Other assets    
Assets    
Assets 0 3
Liabilities 0 0
Effect of Collateral Netting 0 0
Net Carrying Value Presented on the Balance Sheet 0 3
Not Designated as Hedging Instrument | Commodity | Other accruals    
Liabilities    
Assets 109 1,188
Liabilities (137) (1,281)
Effect of Collateral Netting 20 80
Net Carrying Value Presented on the Balance Sheet (8) (13)
Total    
Effect of Collateral Netting 20 80
Not Designated as Hedging Instrument | Commodity | Other liabilities and deferred credits    
Liabilities    
Assets 10 0
Liabilities (12) (1)
Effect of Collateral Netting 0 0
Net Carrying Value Presented on the Balance Sheet (2) (1)
Total    
Effect of Collateral Netting $ 0 $ 0