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Variable Annuity and Insurance Guarantees (Separate Account Balances by Type) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Mutual funds |  |
Variable Annuity and Insurance Guarantees |  |
Total mutual funds | $ 71,346 | $ 66,522
Equity [Member] |  |
Variable Annuity and Insurance Guarantees |  |
Total mutual funds | 42,976 | 39,764
Bond [Member] |  |
Variable Annuity and Insurance Guarantees |  |
Total mutual funds | 22,622 | 21,190
Other [Member] |  |
Variable Annuity and Insurance Guarantees |  |
Total mutual funds | $ 5,748 | $ 5,568

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