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Other Assets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Other Assets [Abstract] |  |  |
Goodwill | $ 3,852 | $ 3,315 | $ 3,072
Other intangible assets, at amortized cost | 265 | 267 |
Other | 13,562 | 10,635 |
Total | $ 17,679 | $ 14,217 |

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