Commitments And Contingencies (Tables)	12 Months Ended
	Dec. 31, 2021
Commitments And Contingencies [Abstract]
Schedule Of Lease Information	At December 31, 2021 2020Operating Leases: ROU assets: Operating lease ROU, third-party joint project and other assets$ 146 $ 132 Lease liabilities: Operating lease and other current liabilities$ 37 $ 29Operating lease, third-party joint project and other obligations 133 124Total operating lease liabilities$ 170 $ 153 Weighted-average remaining lease term (in years) 7 7Weighted-average discount rate 2.5% 2.8%
Schedule Of Lease Costs	Year Ended December 31, 2021 2020 2019Operating lease cost: Operating lease costs (including amounts allocated to property, plant and equipment)$ 51 $ 42 $ 40Short-term lease costs 11 10 34Total operating lease costs$ 62 $ 52 $ 74 Operating lease payments: Cash paid for amounts included in the measurement of lease liabilities$ 40 $ 35 $ 32
Schedule Of Operating Lease Maturity	Year Amount2022 $ 402023 322024 252025 172026 10Thereafter 56Total undiscounted lease payments 180Less imputed interest (10)Total operating lease obligations $ 170