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Significant Accounting Policies - Schedule of Loan Servicing Rights Recognized (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounting Policies [Abstract]      
Beginning balance, mortgage servicing rights $ 561 $ 579 $ 557
Mortgage servicing rights recognized 82 146 194
Mortgage servicing rights sold 0 0 0
Amortization expense (144) (164) (172)
Ending balance, mortgage servicing rights $ 499 $ 561 $ 579