v3.8.0.1

Certain Long-Duration Contracts With Guarantees (Separate Account Investment Options) (Details) - Annuity Contracts - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate Account Investment Options | $ 158,510 | $ 146,578
Equity funds |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate Account Investment Options | 93,798 | 86,751
Bond funds |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate Account Investment Options | 58,939 | 48,789
Balanced funds |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate Account Investment Options | 1,382 | 914
Money market funds |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |
Separate Account Investment Options | $ 4,391 | $ 10,124

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