Financial Derivatives (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Gain (loss) on net investment hedge derivatives	$ (53,000,000)	$ 119,000,000	$ 0
Cash and securities held to collateralize net derivative assets	2,300,000,000
Cash and securities pledged to collateralize net derivative liabilities	1,900,000,000
Aggregate fair value of all derivative instruments with credit-risk-related contingent features	4,200,000,000	5,800,000,000
Collateral posted on derivative instruments with credit-risk-related contingent features	1,000,000,000.0	1,700,000,000
Maximum amount of collateral PNC would have been required to post if the credit-risk-related contingent features underlying these agreements had been triggered	3,200,000,000	4,100,000,000
Cash Flow Hedging | Interest rate contracts:
Derivative [Line Items]
Cash flow hedge gain (loss) to be reclassified within twelve months	1,100,000,000
Cash flow hedge gain (loss) to be reclassified within twelve months, net of tax	$ 900,000,000
Maximum length of time over which forecasted loan cash flows are hedged	8 years
Net Investment Hedging | Foreign exchange contracts:
Derivative [Line Items]
Gain (loss) from components excluded from assessment of net investment hedge effectiveness net	$ 0	$ 0	$ 0