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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 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Assets |  |
Mortgage loans | $ 1,040 | $ 973
Liabilities |  |
Long term debt | 2,538 | 2,779
Carrying Amount |  |
Assets |  |
Mortgage loans | 1,040 | 973
Liabilities |  |
Short term debt | 243 | 0
Long term debt | 2,538 | 2,779
Estimated Fair Value |  |
Assets |  |
Mortgage loans | 973 | 1,018
Liabilities |  |
Short term debt | 248 | 0
Long term debt | 2,349 | 2,978
Level 1 | Estimated Fair Value |  |
Assets |  |
Mortgage loans | 0 | 0
Liabilities |  |
Short term debt | 0 | 0
Long term debt | 0 | 0
Level 2 | Estimated Fair Value |  |
Assets |  |
Mortgage loans | 0 | 0
Liabilities |  |
Short term debt | 248 | 0
Long term debt | 2,349 | 2,978
Level 3 | Estimated Fair Value |  |
Assets |  |
Mortgage loans | 973 | 1,018
Liabilities |  |
Short term debt | 0 | 0
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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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date. + References No definition available. + Details
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