v3.8.0.1

Investments (Net Unrealized Gains Losses on Investments by Asset Class) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Gain (Loss) on Investments [Line Items] |  |  |
Net Unrealized Gains (Losses) on Investments | $ 36,398 | $ 32,732 | $ 28,474
Fixed Maturities | Available-for-sale | OTTI |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Net Unrealized Gains (Losses) on Investments | 286 | 312 | 234
Fixed Maturities | Available-for-sale | All Other |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Net Unrealized Gains (Losses) on Investments | 34,109 | 28,526 | 24,673
Equity securities | Available-for-sale |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Net Unrealized Gains (Losses) on Investments | 2,027 | 2,599 | 2,427
Derivatives designated as cash flow hedges |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Net Unrealized Gains (Losses) on Investments | (39) | 1,316 | 1,165
Other Investments |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Net Unrealized Gains (Losses) on Investments | 15 | $ (21) | $ (25)
Other Investments | Held-to-maturity |  |  |
Gain (Loss) on Investments [Line Items] |  |  |
Net Unrealized Gains (Losses) on Investments | $ 0 |  |

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