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Supplemental Cash Flow Information - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Supplementary Insurance Information |  |  |
Non-cash modifications of certain mortgage loans, fixed income securities, limited partnership interests and other investments, as well as mergers completed with equity securities | $ 61 | $ 198 | $ 94
Non-cash financing activities related to the issuance of shares for vested restricted stock units | 56 | 50 | $ 32
Operating lease, payments | 156 | 155 |
Right-of-use asset obtained in exchange for operating lease liability | $ 51 | 604 |
Accounting Standards Update 2016-02 |  |  |
Supplementary Insurance Information |  |  |
Right-of-use asset obtained in exchange for operating lease liability |  | $ 488 |

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