CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 392	$ 478	$ 726	$ 989
Other comprehensive income (loss):
Net unrealized derivative instruments gains (losses) arising during the periods, net of income taxes of ($48), ($175), ($193), and ($115), respectively	(129)	(505)	(534)	(332)
Reclassification adjustment for net derivative (gains) losses included in net income, net of income taxes of $62, $35, $116, and $68, respectively	170	101	319	195
Net unrealized debt securities gains (losses) arising during the periods, net of income taxes of ($9), ($80), ($65), and $29, respectively	(29)	(239)	(202)	88
Reclassification of net debt securities (gains) losses to net income, net of income taxes of $4, $7, $9, and $14, respectively	15	20	29	40
Employee benefit plans:
Actuarial gain (loss), net of income taxes of $—, $—, $1, and $—, respectively	0	0	4	0
Reclassification of actuarial (gain) loss to net income, net of income taxes of $1, $1, $2, and $2, respectively	2	3	7	6
Total other comprehensive income (loss), net of income taxes	29	(620)	(377)	(3)
Total comprehensive income (loss)	$ 421	$ (142)	$ 349	$ 986