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Fair Value - Balance Sheet Grouping (Details) - Nonrecurring - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Carrying Value |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Mortgage loans | $ 1,361 |
Equity securities | 140 |
Equity securities |  | $ 47
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Investment contracts with a fixed maturity | 5 |
Investment contracts without a fixed maturity | 382 |
Long-term debt | 72,709 | 25,726
Estimated Fair Value |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Mortgage loans | 1,366 |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Investment contracts with a fixed maturity | 5 |
Investment contracts without a fixed maturity | 357 |
Long-term debt | 71,252 | 26,756
Estimated Fair Value | Level 1 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Mortgage loans | 0 |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Investment contracts with a fixed maturity | 0 |
Investment contracts without a fixed maturity | 0 |
Long-term debt | 71,252 | 26,756
Estimated Fair Value | Level 2 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Mortgage loans | 0 |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Investment contracts with a fixed maturity | 0 |
Investment contracts without a fixed maturity | 0 |
Long-term debt | 0 | 0
Estimated Fair Value | Level 3 |  |
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |  |
Mortgage loans | 1,366 |
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] |  |
Investment contracts with a fixed maturity | 5 |
Investment contracts without a fixed maturity | 357 |
Long-term debt | $ 0 | $ 0

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- Definition Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75025870&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75027002&loc=d3e40346-111594 + Details
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