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Investments - Unrealized net capital gains and losses included in AOCI (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair value |  |
Fixed income securities | $ 58,992,000,000 | $ 57,839,000,000
Equity securities | 6,621,000,000 | 5,666,000,000
Short-term investments | 1,944,000,000 | 4,288,000,000
Derivative instruments | 2,000,000 | 5,000,000
Gross unrealized Gains |  |
Fixed income securities | 1,750,000,000 | 1,710,000,000
Equity securities | 1,172,000,000 | 594,000,000
Short-term investments | 0 | 0
Derivative instruments | 2,000,000 | 5,000,000
Gross unrealized Losses |  |
Fixed income securities | (283,000,000) | (447,000,000)
Equity securities | (12,000,000) | (85,000,000)
Short-term investments | 0 | 0
Derivative instruments | (3,000,000) | (3,000,000)
Unrealized net gains (losses) |  |
Fixed income securities | 1,467,000,000 | 1,263,000,000
Equity securities | 1,160,000,000 | 509,000,000
Short-term investments | 0 | 0
Derivative instruments | (1,000,000) | 2,000,000
EMA limited partnerships | 1,000,000 | (4,000,000)
Unrealized net capital gains and losses, pre-tax | 2,627,000,000 | 1,770,000,000
Amounts recognized for: |  |
Insurance reserves | (315,000,000) | 0
DAC and DSI | (196,000,000) | (146,000,000)
Amounts recognized | (511,000,000) | (146,000,000)
Deferred income taxes | (454,000,000) | (571,000,000)
Total unrealized net capital gains and losses | 1,662,000,000 | 1,053,000,000
Fair value of derivative securities classified as liabilities, with unrealized net gains (losses) in AOCI | $ 2,000,000 |
Fair value of derivative securities classified as assets, with unrealized net gains (losses) in AOCI |  | $ 5,000,000

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