Other Liabilities - Schedule of Other Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Other Liabilities Disclosure [Abstract]
Fair value of derivative financial instruments	$ 912	$ 486
Lease liabilities	411	352
Accrued expenses and accounts payable	462	275
Commitments to fund tax credit investments	901	295
Deferred taxes	3,627	286
Reserve for off-balance sheet credit exposure	318	106
Incentive plan liabilities	518	267
Accrued interest payable	146	57
Other	854	464
Total other liabilities	$ 8,149	$ 2,588