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Fair Value - Carrying Value and Fair Value Classified by Level (Details) - Nonrecurring - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Carrying Value |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Mortgage loans | $ 1,047 | $ 1,213
Equity securities | 145 | 149
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Investment contracts with a fixed maturity | 5 | 5
Investment contracts without a fixed maturity | 322 | 372
Long-term debt | 64,647 | 68,480
Estimated Fair Value |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Mortgage loans | 1,070 | 1,239
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Investment contracts with a fixed maturity | 5 | 5
Investment contracts without a fixed maturity | 371 | 392
Long-term debt | 75,940 | 74,306
Estimated Fair Value | Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Mortgage loans | 0 | 0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Investment contracts with a fixed maturity | 0 | 0
Investment contracts without a fixed maturity | 0 | 0
Long-term debt | 75,940 | 74,306
Estimated Fair Value | Level 2 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Mortgage loans | 0 | 0
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Investment contracts with a fixed maturity | 0 | 0
Investment contracts without a fixed maturity | 0 | 0
Long-term debt | 0 | 0
Estimated Fair Value | Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Mortgage loans | 1,070 | 1,239
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Investment contracts with a fixed maturity | 5 | 5
Investment contracts without a fixed maturity | 371 | 392
Long-term debt | $ 0 | $ 0

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- Definition Investment Contracts Without A Fixed Maturity, Fair Value Disclosure. + References No definition available. + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
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- Definition Amount of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120269885&loc=SL75117539-209714 + Details
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