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Investments - Net Investment Income and Investment Gains (Losses) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Net Investment Income [Line Items] |  |  |  |
Total investment income | $ 569 | $ 567 | $ 1,245 | $ 1,088
Investment expenses | (18) | (16) | (37) | (31)
Investment gains (losses) | 2 | (3) | 33 | 6
Net investment income | 551 | 551 | 1,208 | 1,057
Fixed Maturity Securities [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 455 | 444 | 910 | 890
Investment gains (losses) | (3) | 4 | (9) | 22
Limited Partnership Investments [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 43 | 60 | 124 | 108
Short Term and Other [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 14 | 11 | 29 | 20
Investment gains (losses) |  | (1) |  |
Equity Securities [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 16 | 12 | 46 | 22
Investment gains (losses) | 11 | (10) | 53 | (25)
Income From Trading Portfolio [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 29 | 23 | 110 | 20
Other [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Total investment income | 12 | 17 | 26 | 28
Derivative Instruments [Member] |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment gains (losses) | $ (6) | $ 4 | $ (11) | $ 9

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- Definition Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 + Details
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