Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 1,429	$ 1,826
Other comprehensive income (loss), before tax and net of reclassifications into Net income
Net change in debt securities	(6,315)	(1,194)
Net change in cash flow hedge derivatives	(1,758)	(775)
Pension and other postretirement benefit plan adjustments	54	30
Net change in Other	(3)	1
Other comprehensive income (loss), before tax and net of reclassifications into Net income	(8,022)	(1,938)
Income tax benefit related to items of other comprehensive income	1,882	458
Other comprehensive income (loss), after tax and net of reclassifications into Net income	(6,140)	(1,480)
Comprehensive income (loss)	(4,711)	346
Less: Comprehensive income attributable to noncontrolling interests	21	10
Comprehensive income (loss) attributable to PNC	$ (4,732)	$ 336