Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Details) - Nonrecurring - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
ASSETS MEASURED ON A NONRECURRING BASIS
Collateral-dependent loans	$ 207	$ 104
Accrued income and other assets	25	29
Total assets on a recurring basis at fair value	232	133
Level 1
ASSETS MEASURED ON A NONRECURRING BASIS
Collateral-dependent loans	0	0
Accrued income and other assets	0	0
Total assets on a recurring basis at fair value	0	0
Level 2
ASSETS MEASURED ON A NONRECURRING BASIS
Collateral-dependent loans	0	0
Accrued income and other assets	0	0
Total assets on a recurring basis at fair value	0	0
Level 3
ASSETS MEASURED ON A NONRECURRING BASIS
Collateral-dependent loans	207	104
Accrued income and other assets	25	29
Total assets on a recurring basis at fair value	$ 232	$ 133