CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 2,073	$ 2,319	$ 1,057
Other comprehensive income (loss):
Net unrealized derivative instruments gains (losses) arising during the periods, net of income taxes of ($466), ($17) and $33, respectively	(1,340)	(49)	97
Reclassification adjustment for net derivative (gains) losses included in net income, net of income taxes of $30, ($34) and ($38), respectively	85	(101)	(111)
Net unrealized debt securities gains (losses) arising during the periods, net of income taxes of ($868), ($172) and $124, respectively	(2,608)	(528)	382
Reclassification of net debt securities (gains) losses to net income, net of income taxes of ($2), ($2) and ($1), respectively	(7)	(8)	(3)
Employee benefit plans:
Actuarial gain (loss), net of income taxes of ($15), $19 and ($10), respectively	(37)	55	(27)
Reclassification of actuarial (gain) loss to net income, net of income taxes of $2, $7 and $4, respectively	12	26	13
Total other comprehensive income (loss), net of income taxes	(3,895)	(605)	351
Total comprehensive income (loss)	$ (1,822)	$ 1,714	$ 1,408