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Fair Value Measurements - Fair Value Disclosures of Financial Instruments (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
ASSETS
Trading account assets		$ 1,142	$ 829
Derivative assets		181	1,024
Securities available for sale		37,185	39,117
Held-to-maturity securities		8,575	8,710
Loans, net of unearned income		112,606	119,394
Loans held for sale, carrying amount	[1]	483	963
LIABILITIES
Long-term debt, carrying amount		19,554	19,307
Carrying Amount
ASSETS
Trading account assets		1,142	829
Other investments		1,244	1,308
Loans, net of unearned income (residential)		9	9
Loans held for sale (residential)		51	24
Securities available for sale		37,185	39,117
Held-to-maturity securities		8,575	8,710
Loans, net of unearned income		111,089	118,048
Loans held for sale, carrying amount		432	939
Cash and short-term investments		11,758	3,319
LIABILITIES
Time deposits, carrying amount		14,776	7,373
Short-term borrowings, carrying amount		3,091	9,463
Long-term debt, carrying amount		19,554	19,307
Deposits with no stated maturity		130,811	135,222
Estimate of Fair Value Measurement
ASSETS
Trading account assets		1,142	829
Other investments		1,244	1,308
Loans, net of unearned income (residential)		9	9
Loans held for sale (residential)		51	24
Securities available for sale		37,185	39,117
Held-to-maturity securities		8,056	8,113
Loans, net of unearned income		105,950	112,590
Loans held for sale, carrying amount		432	939
Cash and short-term investments		11,758	3,319
LIABILITIES
Time deposits		14,911	7,392
Short-term borrowings		3,091	9,463
Long-term debt		19,008	18,881
Deposits with no stated maturity		130,811	135,222
Estimate of Fair Value Measurement | Level 1
ASSETS
Trading account assets		0	0
Other investments		0	4
Loans, net of unearned income (residential)		0	0
Loans held for sale (residential)		0	0
Securities available for sale		0	0
Held-to-maturity securities		0	0
Loans, net of unearned income		0	0
Loans held for sale, carrying amount		0	0
Cash and short-term investments		11,758	3,319
LIABILITIES
Time deposits		0	0
Short-term borrowings		30	126
Long-term debt		11,288	12,196
Deposits with no stated maturity		0	0
Estimate of Fair Value Measurement | Level 2
ASSETS
Trading account assets		1,142	829
Other investments		0	0
Loans, net of unearned income (residential)		0	0
Loans held for sale (residential)		51	24
Securities available for sale		37,185	39,117
Held-to-maturity securities		8,056	8,113
Loans, net of unearned income		0	0
Loans held for sale, carrying amount		0	0
Cash and short-term investments		0	0
LIABILITIES
Time deposits		14,911	7,392
Short-term borrowings		3,061	9,337
Long-term debt		7,720	6,685
Deposits with no stated maturity		130,811	135,222
Estimate of Fair Value Measurement | Level 3
ASSETS
Trading account assets		0	0
Other investments		1,183	1,234
Loans, net of unearned income (residential)		9	9
Loans held for sale (residential)		0	0
Securities available for sale		0	0
Held-to-maturity securities		0	0
Loans, net of unearned income		105,950	112,590
Loans held for sale, carrying amount		432	939
Cash and short-term investments		0	0
LIABILITIES
Time deposits		0	0
Short-term borrowings		0	0
Long-term debt		0	0
Deposits with no stated maturity		0	0
Estimate of Fair Value Measurement | Measured at NAV
ASSETS
Other investments		61	70
Not Designated as Hedging Instrument | Carrying Amount
ASSETS
Derivative assets		168	927
LIABILITIES
Derivative liabilities		1,304	1,485
Not Designated as Hedging Instrument | Estimate of Fair Value Measurement
ASSETS
Derivative assets		168	927
Derivative assets, netting adjustment		(792)	(740)
LIABILITIES
Derivative liabilities		1,304	1,485
Derivative liabilities, netting adjustment		(461)	(1,262)
Not Designated as Hedging Instrument | Estimate of Fair Value Measurement | Level 1
ASSETS
Derivative assets		74	112
LIABILITIES
Derivative liabilities		58	107
Not Designated as Hedging Instrument | Estimate of Fair Value Measurement | Level 2
ASSETS
Derivative assets		886	1,552
LIABILITIES
Derivative liabilities		1,707	2,637
Not Designated as Hedging Instrument | Estimate of Fair Value Measurement | Level 3
ASSETS
Derivative assets		0	3
LIABILITIES
Derivative liabilities		0	3
Designated as Hedging Instrument | Carrying Amount
ASSETS
Derivative assets		13	97
LIABILITIES
Derivative liabilities		0	3
Designated as Hedging Instrument | Estimate of Fair Value Measurement
ASSETS
Derivative assets		13	97
Derivative assets, netting adjustment		(26)	(17)
LIABILITIES
Derivative liabilities		0	3
Derivative liabilities, netting adjustment		(12)
Designated as Hedging Instrument | Estimate of Fair Value Measurement | Level 1
ASSETS
Derivative assets		0	0
LIABILITIES
Derivative liabilities		0	0
Designated as Hedging Instrument | Estimate of Fair Value Measurement | Level 2
ASSETS
Derivative assets		39	114
LIABILITIES
Derivative liabilities		12	3
Designated as Hedging Instrument | Estimate of Fair Value Measurement | Level 3
ASSETS
Derivative assets		0	0
LIABILITIES
Derivative liabilities		$ 0	$ 0
[1] Total loans held for sale include Real estate — residential mortgage loans held for sale at fair value of $51 million at December 31, 2023, and $24 million at December 31, 2022

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