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Contingencies And Commitments (Narrative) (Details) |  | 12 Months Ended
--- | --- | ---
Jan. 22, 2022 USD ($) | Dec. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Loss contingency, estimate |  | $ 120,000,000 |  |
Operating lease ROU asset |  | 147,000,000 | $ 182,000,000 |
Operating lease liability |  | $ 157,000,000 | $ 194,000,000 |
Weighted average discount rate, operating lease |  | 2.60% | 3.20% |
Weighted average remaining operating lease term |  | 5 years | 6 years |
Operating lease expense |  | $ 49,000,000 | $ 50,000,000 | $ 54,000,000
Finance lease, net book value |  | 37,000,000 | 75,000,000 |
Finance Lease, Liability |  | 175,000,000 | 234,000,000 |
Finance Lease, Right-of-Use Asset, Accumulated Amortization |  | $ 436,000,000 | $ 398,000,000 |
Weighted average discount rate, finance lease |  | 1.40% | 2.20% |
Weighted average remaining finance lease term |  | 1 year | 2 years |
Number of leases not yet commenced | item |  | 1 |  |
Present value of minimum lease payments |  | $ 175,000,000 | $ 234,000,000 |
Payables for Congressionally Mandated Assessments |  | 6,000,000 | 9,000,000 |
Other Liabilities [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Finance Lease, Liability |  | 375,000,000 | 216,000,000 |
Present value of minimum lease payments |  | $ 375,000,000 | $ 216,000,000 |
Subsequent Event [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Gain (Loss) Related to Litigation Settlement | $ 92,500,000 |  |  |

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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