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Contingencies And Commitments (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Loss Contingencies [Line Items] |  |  |
Loss contingency, estimate | $ 190 |  |
Operating lease ROU asset | $ 140 | $ 147 |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Total Assets | Total Assets |
Operating lease liability | $ 152 | $ 157 |
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Liabilities | Liabilities |
Weighted average discount rate, operating lease | 3.30% | 2.60% |
Weighted average remaining operating lease term | 5 years |  |
Operating lease expense | $ 45 | $ 49 | $ 50
Finance lease, net book value | $ 14 | $ 37 |
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Total Assets | Total Assets |
Finance Lease, Liability | $ 106 | $ 175 |
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Liabilities | Liabilities |
Finance Lease, Right-of-Use Asset, Accumulated Amortization | $ 458 | $ 436 |
Weighted average discount rate, finance lease | 2.90% | 1.40% |
Weighted average remaining finance lease term | 1 year |  |
Present value of minimum lease payments | $ 106 | $ 175 |
Payables for Congressionally Mandated Assessments | 2 | 6 |
Other Liabilities [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Finance Lease, Liability | 558 | 375 |
Present value of minimum lease payments | $ 558 | $ 375 |

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