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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, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Mortgage loans | $ 1,031 | $ 1,068
Liabilities |  |
Long term debt | 2,778 | 2,776
Carrying Amount |  |
Assets |  |
Mortgage loans | 1,031 | 1,068
Liabilities |  |
Long term debt | 2,778 | 2,776
Estimated Fair Value |  |
Assets |  |
Mortgage loans | 1,106 | 1,151
Liabilities |  |
Long term debt | 3,027 | 3,148
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 | 3,027 | 3,148
Level 3 | Estimated Fair Value |  |
Assets |  |
Mortgage loans | 1,106 | 1,151
Liabilities |  |
Long term debt | $ 0 | $ 0

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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://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 http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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