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Fair Value (Carrying amount and estimated fair value of financial instrument assets and liabilities which are not measured at fair value) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |
Mortgage loans | $ 953 | $ 973
Liabilities |  |
Long term debt | 2,780 | 2,779
Carrying Amount |  |
Assets |  |
Mortgage loans | 953 | 973
Liabilities |  |
Long term debt | 2,780 | 2,779
Estimated Fair Value |  |
Assets |  |
Mortgage loans | 880 | 1,018
Liabilities |  |
Long term debt | 2,563 | 2,978
Level 1 | Estimated Fair Value |  |
Assets |  |
Mortgage loans | 0 | 0
Liabilities |  |
Long term debt | 0 | 0
Level 2 | Estimated Fair Value |  |
Assets |  |
Mortgage loans | 0 | 0
Liabilities |  |
Long term debt | 2,563 | 2,978
Level 3 | Estimated Fair Value |  |
Assets |  |
Mortgage loans | 880 | 1,018
Liabilities |  |
Long term debt | $ 0 | $ 0

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- Definition Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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