Accumulated Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 8,367	$ 8,824	$ 7,044
Total other comprehensive gain (loss), net of tax	(41)	21	(535)
Ending balance	8,167	8,367	8,824
Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(599)	(620)	(85)
Net unrealized gains (losses)	26	63	(534)
Amounts reclassified from AOCI	(67)	(42)	(1)
Total other comprehensive gain (loss), net of tax	(41)	21	(535)
Ending balance	(640)	(599)	(620)
Securities AFS
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(581)	(626)	(45)
Net unrealized gains (losses)	(72)	45	(581)
Amounts reclassified from AOCI	0	0	0
Total other comprehensive gain (loss), net of tax	(72)	45	(581)
Ending balance	(653)	(581)	(626)
Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	10	52	(9)
Net unrealized gains (losses)	106	6	64
Amounts reclassified from AOCI	(69)	(48)	(3)
Total other comprehensive gain (loss), net of tax	37	(42)	61
Ending balance	47	10	52
Pension and Post-retirement Plans
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(28)	(46)	(31)
Net unrealized gains (losses)	(8)	12	(17)
Amounts reclassified from AOCI	2	6	2
Total other comprehensive gain (loss), net of tax	(6)	18	(15)
Ending balance	$ (34)	$ (28)	$ (46)