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Investments (Other Invested Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Other Invested Assets [Line Items] |  |  |
Other invested assets | [1] | $ 18,863 | $ 18,125
LPs/LLCs |  |  |
Other Invested Assets [Line Items] |  |  |
Other invested assets |  | 13,854 | 12,883
Real estate held through direct ownership |  |  |
Other Invested Assets [Line Items] |  |  |
Other invested assets |  | 1,877 | 2,027
Derivative instruments |  |  |
Other Invested Assets [Line Items] |  |  |
Other invested assets |  | 1,869 | 1,915
Other |  |  |
Other Invested Assets [Line Items] |  |  |
Other invested assets |  | 1,263 | 1,300
Mortgage Debt | Real estate-related |  |  |
Other Invested Assets [Line Items] |  |  |
Other invested assets |  | 354 | 409
Equity method | LPs/LLCs |  |  |
Other Invested Assets [Line Items] |  |  |
Other invested assets |  | 9,475 | 8,747
Equity method | Private equity | LPs/LLCs |  |  |
Other Invested Assets [Line Items] |  |  |
Other invested assets |  | 4,735 | 4,311
Equity method | Hedge funds | LPs/LLCs |  |  |
Other Invested Assets [Line Items] |  |  |
Other invested assets |  | 2,732 | 2,451
Equity method | Real estate-related | LPs/LLCs |  |  |
Other Invested Assets [Line Items] |  |  |
Other invested assets |  | 2,008 | 1,985
Fair Value |  |  |
Other Invested Assets [Line Items] |  |  |
Other invested assets |  | 120 | 153
Fair Value | LPs/LLCs |  |  |
Other Invested Assets [Line Items] |  |  |
Other invested assets |  | 4,379 | 4,136
Fair Value | Private equity | LPs/LLCs |  |  |
Other Invested Assets [Line Items] |  |  |
Other invested assets |  | 1,861 | 1,786
Fair Value | Hedge funds | LPs/LLCs |  |  |
Other Invested Assets [Line Items] |  |  |
Other invested assets |  | 2,199 | 2,036
Fair Value | Real estate-related | LPs/LLCs |  |  |
Other Invested Assets [Line Items] |  |  |
Other invested assets |  | $ 319 | $ 314
[1] | See Note 4 for details of balances associated with variable interest entities.

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