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Other Commitments And Contingencies Other Commitments and Contingencies (Expense and Insurance Recoveries) (Details) - USD ($)
$ in Millions
 3 Months Ended 4 Months Ended 9 Months Ended 16 Months Ended 25 Months Ended
Sep. 30, 2020
Dec. 31, 2018
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2020
Expense and Insurance Recoveries [Line Items]          
Third-party claims $ (3)   $ (5) $ 1,041 $ 1,036
Other incident-related costs 5   21 420 441
Total 2 $ 1,023 16 1,461 1,477
Insurance recoveries recorded 0   0 (800) (800)
Total costs incurred $ 2   $ 16 $ 661 $ 677