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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 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Assets |  |  |
Mortgage loans | $ 1,006 | $ 1,040 | [1]
Liabilities |  |  |
Long term debt | 2,539 | 2,538 | [1]
Carrying Amount |  |  |
Assets |  |  |
Mortgage loans | 1,006 | 1,040 |
Liabilities |  |  |
Short term debt | 243 | 243 |
Long term debt | 2,539 | 2,538 |
Estimated Fair Value |  |  |
Assets |  |  |
Mortgage loans | 958 | 973 |
Liabilities |  |  |
Short term debt | 245 | 248 |
Long term debt | 2,387 | 2,349 |
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 | 245 | 248 |
Long term debt | 2,387 | 2,349 |
Level 3 | Estimated Fair Value |  |  |
Assets |  |  |
Mortgage loans | 958 | 973 |
Liabilities |  |  |
Short term debt | 0 | 0 |
Long term debt | $ 0 | $ 0 |
[1] | As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021. Prior period amounts in the financial statements have been adjusted to reflect application of the new guidance. See Note A to the Condensed Consolidated Financial Statements for additional information.

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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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