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Parent Company (Income Statement) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating Expenses [Abstract] |  |  |
Income from continuing operations before income taxes and noncontrolling interests | $ 3,429 | $ 5,492 | $ 5,486
Income tax benefits | 426 | 901 | 928
Net income from continuing operations | 3,003 | 4,591 | 4,558
Income from discontinued operations before taxes | 5,777 | 988 | 942
Income taxes from discontinued operations | 1,222 | 161 | 154
Net income from discontinued operations | 4,555 | 827 | 788
Other comprehensive income (loss), after tax and net of reclassifications into Net income | 1,971 | 1,524 | (583)
Comprehensive income attributable to PNC | 9,488 | 6,893 | 4,718
Discontinued Operations |  |  |
Operating Expenses [Abstract] |  |  |
Other comprehensive income (loss), after tax and net of reclassifications into Net income | 115 | 4 | (43)
Parent Company |  |  |
Operating Revenues [Abstract] |  |  |
Interest income | 38 | 169 | 147
Noninterest income | 37 | 48 | (1)
Total operating revenue | 14,076 | 3,957 | 2,942
Operating Expenses [Abstract] |  |  |
Interest expense | 179 | 325 | 281
Other expense | 91 | 146 | 139
Total operating expense | 270 | 471 | 420
Income before income taxes and equity in undistributed net income of subsidiaries | 13,806 | 3,486 | 2,522
Equity in undistributed net income of subsidiaries: |  | 1,363 | 2,307
Income from continuing operations before income taxes and noncontrolling interests | 1,711 | 4,321 | 4,305
Income tax benefits | (1,251) | (221) | (208)
Net income from continuing operations | 2,962 | 4,542 | 4,513
Income from discontinued operations before taxes | 5,777 | 988 | 942
Income taxes from discontinued operations | 1,222 | 161 | 154
Net income from discontinued operations | 4,555 | 827 | 788
Net income | 7,517 | 5,369 | 5,301
Net pension and other postretirement benefit plan activity arising during the period. | 1 | (2) | 1
Other comprehensive income (loss), after tax and net of reclassifications into Net income | 1 | (2) | 1
Comprehensive income attributable to PNC | 7,518 | 5,367 | 5,302
Parent Company | Bank Subsidiaries And Bank Holding Company |  |  |
Operating Revenues [Abstract] |  |  |
Dividends from | 13,701 | 3,570 | 2,639
Operating Expenses [Abstract] |  |  |
Equity in undistributed net income of subsidiaries: | (12,009) | 671 | 1,602
Parent Company | Bank Subsidiaries And Bank Holding Company | Discontinued Operations |  |  |
Operating Revenues [Abstract] |  |  |
Dividends from | 126 | 460 | 418
Operating Expenses [Abstract] |  |  |
Equity in undistributed net income of subsidiaries: | 5,651 | 528 | 524
Parent Company | Non Bank Subsidiaries |  |  |
Operating Revenues [Abstract] |  |  |
Dividends from | 300 | 170 | 157
Operating Expenses [Abstract] |  |  |
Equity in undistributed net income of subsidiaries: | $ (86) | $ 164 | $ 181

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