CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 1,608	$ 2,073	$ 2,319
Other comprehensive income (loss):
Net unrealized derivative instruments gains (losses) arising during the periods, net of income taxes of ($39), ($466) and ($17), respectively	(106)	(1,340)	(49)
Reclassification adjustment for net derivative (gains) losses included in net income, net of income taxes of $161, $30 and ($34), respectively	435	85	(101)
Net unrealized debt securities gains (losses) arising during the periods, net of income taxes of $119, ($868) and ($172), respectively	350	(2,608)	(528)
Reclassification of net debt securities (gains) losses to net income, net of income taxes of $28, ($2) and ($2), respectively	83	(7)	(8)
Employee benefit plans:
Actuarial gain (loss), net of income taxes of $15, ($15) and $19, respectively	28	(37)	55
Reclassification of actuarial (gain) loss to net income, net of income taxes of $5, $2 and $7, respectively	12	12	26
Total other comprehensive income (loss), net of income taxes	802	(3,895)	(605)
Total comprehensive income (loss)	$ 2,410	$ (1,822)	$ 1,714