Fair Values - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - Nonrecurring - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Assets at fair value
Loans	$ 5,983		$ 5,983		$ 5,611
Other assets—Other investments	5		5		8
Other assets—ROU assets	7		7		16
Total	5,995		5,995		5,635
Liabilities
Other liabilities and accrued expenses—Lending commitments	501		501		243
Total	501		501		243
Assets
Fair Value Adjustment Disclosure
Gains (losses) from fair value remeasurements	(176)	$ (43)	(235)	$ (123)
Loans
Fair Value Adjustment Disclosure
Gains (losses) from fair value remeasurements	(167)	(38)	(221)	(55)
Goodwill
Fair Value Adjustment Disclosure
Gains (losses) from fair value remeasurements	0	0	0	(8)
Intangibles
Fair Value Adjustment Disclosure
Gains (losses) from fair value remeasurements	0	(1)	0	(3)
Other assets—Other investments
Fair Value Adjustment Disclosure
Gains (losses) from fair value remeasurements	(4)	(2)	(6)	(53)
Other assets—Premises, equipment and software
Fair Value Adjustment Disclosure
Gains (losses) from fair value remeasurements	(1)	(2)	(2)	(4)
Other assets—ROU assets
Fair Value Adjustment Disclosure
Gains (losses) from fair value remeasurements	(4)	0	(6)	0
Liabilities
Fair Value Adjustment Disclosure
Gains (losses) from fair value remeasurements	(191)	5	(210)	40
Other liabilities and accrued expenses—Lending commitments
Fair Value Adjustment Disclosure
Gains (losses) from fair value remeasurements	(191)	$ 5	(210)	$ 40
Level 2
Assets at fair value
Loans	3,411		3,411		4,035
Other assets—Other investments	0		0		0
Other assets—ROU assets	7		7		16
Total	3,418		3,418		4,051
Liabilities
Other liabilities and accrued expenses—Lending commitments	359		359		173
Total	359		359		173
Level 3
Assets at fair value
Loans	2,572		2,572		1,576
Other assets—Other investments	5		5		8
Other assets—ROU assets	0		0		0
Total	2,577		2,577		1,584
Liabilities
Other liabilities and accrued expenses—Lending commitments	142		142		70
Total	$ 142		$ 142		$ 70