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Other Assets - Equity Method Investments and Leases - Investees (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Mitsubishi UFJ Morgan Stanley Securities Co., Ltd      
Equity Method Investments      
Income (loss) from investment in MUMSS $ 35 $ 168 $ 80