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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, 2024 | Dec. 31, 2023
--- | --- | ---
Assets |  |
Mortgage loans | $ 1,029 | $ 1,035
Liabilities |  |
Long-term debt | 2,970 | 2,481
Carrying Amount |  |
Assets |  |
Mortgage loans | 1,029 | 1,035
Liabilities |  |
Short-term debt | 550 | 550
Long-term debt | 2,970 | 2,481
Estimated Fair Value |  |
Assets |  |
Mortgage loans | 987 | 997
Liabilities |  |
Short-term debt | 549 | 546
Long-term debt | 2,852 | 2,385
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 | 549 | 546
Long-term debt | 2,852 | 2,385
Level 3 | Estimated Fair Value |  |
Assets |  |
Mortgage loans | 987 | 997
Liabilities |  |
Short-term debt | 0 | 0
Long-term debt | $ 0 | $ 0

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- Definition Amount, after deduction of 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 -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 + 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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