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Basis of Presentation - Out of Period Correction (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Out-of-period corrections |  |  |  |  |  |
Other comprehensive income (loss), net of tax | $ (361) |  | $ 122 |  | $ (530) | $ 254
Management and financial advice fees |  |  |  |  |  |
Out-of-period corrections |  |  |  |  |  |
Revenue from contracts with customers | $ (2,367) |  | $ (1,893) |  | $ (6,720) | $ (5,365)
Correction related to defined benefit plans |  |  |  |  |  |
Out-of-period corrections |  |  |  |  |  |
Other comprehensive income (loss), net of tax |  | $ 29 |  |  |  |
Correction related to performance fees | Management and financial advice fees |  |  |  |  |  |
Out-of-period corrections |  |  |  |  |  |
Revenue from contracts with customers |  |  |  | $ 19 |  |

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