CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 430	$ 636	$ 1,419	$ 1,420
Other comprehensive income (loss):
Net unrealized derivative instruments gains (losses) arising during the periods, net of income taxes of ($78), ($258), ($193) and ($494), respectively	(248)	(738)	(580)	(1,407)
Reclassification adjustment for net derivative (gains) losses included in net income, net of income taxes of $37, $12, $105 and $1, respectively	120	34	315	2
Net unrealized debt securities gains (losses) arising during the periods, net of income taxes of ($189), ($305), ($160) and ($933), respectively	(578)	(903)	(490)	(2,759)
Reclassification of net debt securities (gains) losses to net income, net of income taxes of $7, $0, $21 and ($1), respectively	23	0	63	(4)
Reclassification of actuarial (gain) loss to net income, net of income taxes of $2, $2, $4 and $1, respectively	3	2	9	10
Total other comprehensive income (loss), net of income taxes	(680)	(1,605)	(683)	(4,158)
Total comprehensive income (loss)	$ (250)	$ (969)	$ 736	$ (2,738)