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Fair Value Measurements - Fair Value Disclosures of Financial Instruments (Details) - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020
ASSETS
Trading account assets		$ 811	$ 735
Derivative assets		1,524	1,798
Securities available for sale		33,923	27,556
Amortized cost		6,857	7,595
Held-to-maturity securities		7,159	8,023
Loans, net of unearned income (residential)		100,926	101,185
Loans held for sale	[1]	2,296	1,583
LIABILITIES
Long-term debt		12,499	13,709
Carrying Amount
ASSETS
Trading account assets		811	735
Other investments		621	621
Loans, net of unearned income (residential)		11	11
Loans held for sale		236	264
Securities available for sale		33,923	27,556
Amortized cost		6,857	7,595
Loans, net of unearned income (residential)		99,477	99,548
Loans held for sale		2,060	1,319
Short-term investments			0
Cash and short-term investments		16,314	17,285
LIABILITIES
Time deposits		5,219	5,743
Short-term borrowings		1,025	979
Long-term debt		12,499	13,709
Deposits with no stated maturity		136,964	129,539
Fair Value
ASSETS
Trading account assets		811	735
Other investments		621	621
Loans, net of unearned income (residential)		11	11
Loans held for sale		236	264
Securities available for sale		33,923	27,556
Held-to-maturity securities		7,159	8,023
Loans, net of unearned income (residential)		99,253	98,946
Loans held for sale		2,060	1,319
Short-term investments			0
Cash and short-term investments		16,314	17,285
LIABILITIES
Time deposits		5,234	5,765
Short-term borrowings		1,025	979
Long-term debt		13,123	14,659
Deposits with no stated maturity		136,964	129,539
Level 1 | Fair Value
ASSETS
Trading account assets		0	0
Other investments		0	0
Loans, net of unearned income (residential)		0	0
Loans held for sale		0	0
Securities available for sale		0	0
Held-to-maturity securities		0	0
Loans, net of unearned income (residential)		0	0
Loans held for sale		0	0
Short-term investments			0
Cash and short-term investments		16,314	17,285
LIABILITIES
Time deposits		0	0
Short-term borrowings		143	256
Long-term debt		12,396	13,925
Deposits with no stated maturity		0	0
Level 2 | Fair Value
ASSETS
Trading account assets		811	735
Other investments		13	0
Loans, net of unearned income (residential)		0	0
Loans held for sale		236	264
Securities available for sale		33,901	27,543
Held-to-maturity securities		7,159	8,023
Loans, net of unearned income (residential)		0	0
Loans held for sale		0	0
Short-term investments			0
Cash and short-term investments		0	0
LIABILITIES
Time deposits		5,234	5,765
Short-term borrowings		882	723
Long-term debt		727	734
Deposits with no stated maturity		136,964	129,539
Level 3 | Fair Value
ASSETS
Trading account assets		0	0
Other investments		542	555
Loans, net of unearned income (residential)		11	11
Loans held for sale		0	0
Securities available for sale		22	13
Held-to-maturity securities		0	0
Loans, net of unearned income (residential)		99,253	98,946
Loans held for sale		2,060	1,319
Short-term investments			0
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
Measured at NAV | Fair Value
ASSETS
Other investments		66	66
Derivatives Not Designated as Hedging Instruments | Carrying Amount
ASSETS
Derivative assets		1,421	1,676
LIABILITIES
Derivative liabilities		177	154
Derivatives Not Designated as Hedging Instruments | Fair Value
ASSETS
Derivative assets		1,421	1,675
Derivative assets, Netting Adjustment		(316)	(433)
LIABILITIES
Derivative liabilities		177	154
Derivative liabilities, Netting Adjustment		(861)	(675)
Derivatives Not Designated as Hedging Instruments | Level 1 | Fair Value
ASSETS
Derivative assets		74	78
LIABILITIES
Derivative liabilities		64	72
Derivatives Not Designated as Hedging Instruments | Level 2 | Fair Value
ASSETS
Derivative assets		1,625	1,939
LIABILITIES
Derivative liabilities		966	746
Derivatives Not Designated as Hedging Instruments | Level 3 | Fair Value
ASSETS
Derivative assets		38	91
LIABILITIES
Derivative liabilities		8	11
Derivatives Designated as Hedging Instruments | Carrying Amount
ASSETS
Derivative assets		103	123
LIABILITIES
Derivative liabilities		6	(3)
Derivatives Designated as Hedging Instruments | Fair Value
ASSETS
Derivative assets		103	123
Derivative assets, Netting Adjustment		58	53
LIABILITIES
Derivative liabilities		6	(3)
Derivative liabilities, Netting Adjustment		0	0
Derivatives Designated as Hedging Instruments | Level 1 | Fair Value
ASSETS
Derivative assets		0	0
LIABILITIES
Derivative liabilities		0	0
Derivatives Designated as Hedging Instruments | Level 2 | Fair Value
ASSETS
Derivative assets		45	70
LIABILITIES
Derivative liabilities		6	(3)
Derivatives Designated as Hedging Instruments | Level 3 | Fair Value
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 $236 million at March 31, 2021, and $264 million at December 31, 2020.

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