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Regulatory Matters - Schedule of Capital Ratios (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital, actual amount $ 3,174 $ 2,875
Tier 1 capital, actual amount 2,632 2,395
Common equity tier 1, actual amount 2,525 2,289
Leverage, actual amount 2,632 2,395
Risk weighted assets, actual amount $ 26,866 $ 24,900
Total capital, actual ratio 11.81% 11.54%
Total capital, actual ratio tier 1 capital, actual ratio 9.79% 9.62%
Common equity tier 1, actual ratio 9.40% 9.19%
Leverage, actual ratio 8.20% 7.87%
Total capital, well-capitalized requirements amount $ 2,687 $ 2,490
Tier 1 capital, well-capitalized requirements amount $ 1,612 $ 1,608
Total capital, well-capitalized requirements ratio 10.00% 10.00%
Tier 1 capital, well-capitalized requirements ratio 6.00% 6.00%
Total capital, minimum capital requirements amount $ 2,821 $ 2,459
Tier 1 capital, minimum capital requirements amount 2,284 1,961
Common equity tier 1, minimum capital requirements amount 1,881 1,588
Leverage, minimum capital requirements amount $ 1,283 $ 1,218
Total capital, minimum capital requirements ratio 10.50% 9.88%
Tier 1 capital, minimum capital requirements ratio 8.50% 7.88%
Common equity tier 1, minimum capital requirements ratio 7.00% 6.38%
Leverage, minimum capital requirements ratio 4.00% 4.00%
FNBPA    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital, actual amount $ 3,039 $ 2,735
Tier 1 capital, actual amount 2,841 2,553
Common equity tier 1, actual amount 2,761 2,473
Leverage, actual amount 2,841 2,553
Risk weighted assets, actual amount $ 26,806 $ 24,894
Total capital, actual ratio 11.34% 10.99%
Total capital, actual ratio tier 1 capital, actual ratio 10.60% 10.26%
Common equity tier 1, actual ratio 10.30% 9.94%
Leverage, actual ratio 8.87% 8.39%
Total capital, well-capitalized requirements amount $ 2,681 $ 2,489
Tier 1 capital, well-capitalized requirements amount 2,144 1,992
Common equity tier 1, well-capitalized requirements amount 1,742 1,618
Leverage, well-capitalized requirements amount $ 1,601 $ 1,521
Total capital, well-capitalized requirements ratio 10.00% 10.00%
Tier 1 capital, well-capitalized requirements ratio 8.00% 8.00%
Common equity tier 1, well-capitalized requirements ratio 6.50% 6.50%
Leverage, well-capitalized requirements ratio 5.00% 5.00%
Total capital, minimum capital requirements amount $ 2,815 $ 2,458
Tier 1 capital, minimum capital requirements amount 2,279 1,960
Common equity tier 1, minimum capital requirements amount 1,876 1,587
Leverage, minimum capital requirements amount $ 1,281 $ 1,217
Total capital, minimum capital requirements ratio 10.50% 9.88%
Tier 1 capital, minimum capital requirements ratio 8.50% 7.88%
Common equity tier 1, minimum capital requirements ratio 7.00% 6.38%
Leverage, minimum capital requirements ratio 4.00% 4.00%