Consolidated Statement of Changes in Equity - USD ($) shares in Millions, $ in Millions		Total		Cumulative Effect, Period of Adoption, Adjustment		Cumulative Effect, Period of Adoption, Adjusted Balance	[1]	Common stock		Common stock Cumulative Effect, Period of Adoption, Adjusted Balance		Capital Surplus - Preferred Stock		Capital Surplus - Preferred Stock Cumulative Effect, Period of Adoption, Adjusted Balance	[1]	Capital Surplus - Common Stock and Other		Capital Surplus - Common Stock and Other Cumulative Effect, Period of Adoption, Adjusted Balance	[1]	Retained Earnings		Retained Earnings Cumulative Effect, Period of Adoption, Adjustment		Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	[1]	Accumulated Other Comprehensive Income (Loss)		Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance	[1]	Treasury Stock		Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance	[1]	Noncontrolling Interests		Noncontrolling Interests Cumulative Effect, Period of Adoption, Adjusted Balance	[1]
Beginning Balance (in shares) at Dec. 31, 2018	[1]							457		457
Common Stock [Abstract]
Treasury stock activity, shares								(24)
Ending Balance, (in shares) at Dec. 31, 2019	[1]							433		433
Total Equity, Beginning Balance at Dec. 31, 2018		$ 47,770	[1]	$ 62	[2]	$ 47,832		$ 2,711	[1]	$ 2,711	[1]	$ 3,986	[1]	$ 3,986		$ 12,291	[1]	$ 12,291		$ 38,919	[1]	$ 62	[2]	$ 38,981		$ (725)	[1]	$ (725)		$ (9,454)	[1]	$ (9,454)		$ 42	[1]	$ 42
Common Stock [Abstract]
Accounting Standards Update [Extensible Enumeration]		Accounting Standards Update 2016-13 [Member]
Net income		$ 5,418																		5,369														49
Other comprehensive income, net of tax		1,524																								1,524
Dividends, Cash [Abstract]
Common		(1,895)																		(1,895)
Preferred		(236)																		(236)
Preferred stock discount accretion												4								(4)
Common stock activity	[3]	21						1								20
Treasury stock activity		(3,324)														3														(3,327)
Other		3										3				62																		(62)
Total Equity, Ending Balance at Dec. 31, 2019		49,343	[1]	$ (671)	[4]	$ 48,672		$ 2,712	[1]	$ 2,712	[1]	3,993	[1]	$ 3,993		12,376	[1]	$ 12,376		42,215	[1]	$ (671)	[4]	$ 41,544		799	[1]	$ 799		(12,781)	[1]	$ (12,781)		29	[1]	$ 29
Common Stock [Abstract]
Treasury stock activity, shares								(9)
Ending Balance, (in shares) at Dec. 31, 2020	[1]							424
Common Stock [Abstract]
Net income		7,558																		7,517														41
Other comprehensive income, net of tax		1,971																								1,971
Dividends, Cash [Abstract]
Common		(1,980)																		(1,980)
Preferred		(229)																		(229)
Preferred stock discount accretion												4								(4)
Common stock activity	[3]	24						$ 1								23
Treasury stock activity		(1,370)														54														(1,424)
Preferred stock redemption - Series Q	[5]	(480)										(480)
Other		(125)														(86)																		(39)
Total Equity, Ending Balance at Dec. 31, 2020	[1]	54,041						$ 2,713				3,517				12,367				46,848						2,770				(14,205)				31
Common Stock [Abstract]
Treasury stock activity, shares								(4)
Ending Balance, (in shares) at Dec. 31, 2021	[1]							420
Common Stock [Abstract]
Net income		5,725																		5,674														51
Other comprehensive income, net of tax		(2,361)																								(2,361)
Dividends, Cash [Abstract]
Common		(2,056)																		(2,056)
Preferred		(233)																		(233)
Preferred stock discount accretion												5								(5)
Common stock activity	[3]	25														25
Treasury stock activity		(823)														84														(907)
Preferred stock issuance - Series T	[6]	1,487										1,487
Other		(79)														(28)																		(51)
Total Equity, Ending Balance at Dec. 31, 2021	[1]	$ 55,726						$ 2,713				$ 5,009				$ 12,448				$ 50,228						$ 409				$ (15,112)				$ 31

[1] The par value of our preferred stock outstanding was less than $0.5 million at each date and, therefore, is excluded from this presentation.

[2] Represents the impact of the adoption of ASU 2016-02 related primarily to deferred gains on previous sale-leaseback transactions.

[3] Common stock activity totaled less than 0.5 million shares issued.

[4] Represents the impact of the adoption of ASU 2016-13 - Financial Instruments - Credit Losses.

[5] On September 1, 2020, PNC redeemed all 4,800 shares of its Series Q Preferred Stock, as well as all 19.2 million Depositary Shares representing fractional interest in such shares

[6] On September 13, 2021, PNC issued 1,500,000 depositary shares each representing 1/100th ownership in a share of 3.400% fixed-rate reset non-cumulative perpetual preferred stock, Series T, with a par value of $1 per share.