Regulatory Matters (Basel Regulatory Capital) (Details) - Transitional Basel III - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
PNC
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 Capital amount	$ 40,066	$ 39,735
Common equity Tier 1 Capital ratio	10.30%	12.20%
Tier 1 Risk-based capital amount	$ 45,075	$ 43,252
Tier 1 Risk-based capital ratio	0.116	0.132
US regulatory well capitalized level - Tier 1 risk-based capital ratio	0.060	0.060
Total Risk-based capital amount	$ 52,451	$ 51,001
Total Risk-based capital ratio	0.135	0.156
US regulatory well capitalized level - Total risk-based capital ratio	0.100	0.100
Leverage amount	$ 45,075	$ 43,252
Leverage ratio	0.082	0.095
PNC Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 Capital amount	$ 42,024	$ 35,232
Common equity Tier 1 Capital ratio	11.10%	11.00%
US regulatory well capitalized level - Common equity Tier 1 risk-based capital ratio	6.50%	6.50%
Tier 1 Risk-based capital amount	$ 42,024	$ 35,232
Tier 1 Risk-based capital ratio	0.111	0.110
US regulatory well capitalized level - Tier 1 risk-based capital ratio	0.080	0.080
Total Risk-based capital amount	$ 49,083	$ 42,440
Total Risk-based capital ratio	0.129	0.132
US regulatory well capitalized level - Total risk-based capital ratio	0.100	0.100
Leverage amount	$ 42,024	$ 35,232
Leverage ratio	0.078	0.079
US regulatory well capitalized level - Leverage ratio	0.050	0.050