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Consolidated Statement of Changes in Equity - USD ($) $ in Millions | Total | Cumulative Effect, Period of Adoption, Adjustment | Cumulative Effect, Period of Adoption, Adjusted Balance | [1] | Common stock | Common stock Cumulative Effect, Period of Adoption, Adjusted Balance | Capital Surplus - Preferred Stock | Capital Surplus - Preferred Stock Cumulative Effect, Period of Adoption, Adjusted Balance | [1] | Capital Surplus - Common Stock and Other | Capital Surplus - Common Stock and Other Cumulative Effect, Period of Adoption, Adjusted Balance | [1] | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance | [1] | Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjustment | [2] | Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance | [1] | Treasury Stock | Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance | [1] | Noncontrolling Interests | Noncontrolling Interests Cumulative Effect, Period of Adoption, Adjusted Balance | [1]
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Beginning Balance (in shares) at Dec. 31, 2017 | [1] |  |  |  |  |  | 473,000,000 |  | 473,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock activity, shares |  |  |  |  |  |  | (16,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance, (in shares) at Dec. 31, 2018 | [1] |  |  |  |  |  | 457,000,000 |  | 457,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Equity, Beginning Balance at Dec. 31, 2017 |  | $ 47,585.0 | [1] | $ (16.0) | [2] | $ 47,569.0 | $ 2,710.0 | [1] | $ 2,710.0 | [1] | $ 3,985.0 | [1] | $ 3,985.0 | $ 12,389.0 | [1] | $ 12,389.0 | $ 35,481.0 | [1] | $ (22.0) | [2] | $ 35,459.0 | $ (148.0) | [1] | $ 6.0 | $ (142.0) | $ (6,904.0) | [1] | $ (6,904.0) | $ 72.0 | [1] | $ 72.0
Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] |  | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ 5,346.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,301.0 |  |  |  |  |  |  |  |  |  |  |  | 45.0 |  |
Other comprehensive income (loss), net of tax |  | (583.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (583.0) |  |  |  |  |  |  |  |  |
Dividends, Cash [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common |  | (1,601.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,601.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred |  | (236.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (236.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock discount accretion |  |  |  |  |  |  |  |  |  |  | 4.0 |  |  |  |  |  | (4.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock activity | [3] | 20.0 |  |  |  |  | 1.0 |  |  |  |  |  |  | 19.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock activity |  | (2,651.0) |  |  |  |  |  |  |  |  |  |  |  | (101.0) |  |  |  |  |  |  |  |  |  |  |  | (2,550.0) |  |  |  |  |
Other |  | (94.0) |  |  |  |  |  |  |  |  | (3.0) |  |  | (16.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (75.0) |  |
Total Equity, Ending Balance at Dec. 31, 2018 |  | 47,770.0 | [1] | 62.0 | [4] | 47,832.0 | $ 2,711.0 | [1] | $ 2,711.0 | [1] | 3,986.0 | [1] | 3,986.0 | 12,291.0 | [1] | 12,291.0 | 38,919.0 | [1] | 62.0 | [4] | 38,981.0 | (725.0) | [1] |  | (725.0) | (9,454.0) | [1] | (9,454.0) | 42.0 | [1] | 42.0
Dividends, Cash [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock activity, shares |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value less than $.5 million at each date |  | $ 0.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock activity, shares |  |  |  |  |  |  | (24,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance, (in shares) at Dec. 31, 2019 | [1] |  |  |  |  |  | 433,000,000 |  | 433,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] |  | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ 5,418.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,369.0 |  |  |  |  |  |  |  |  |  |  |  | 49.0 |  |
Other comprehensive income (loss), net of tax |  | 1,524.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,524.0 |  |  |  |  |  |  |  |  |
Dividends, Cash [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common |  | (1,895.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,895.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred |  | (236.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (236.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock discount accretion |  |  |  |  |  |  |  |  |  |  | 4.0 |  |  |  |  |  | (4.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock activity | [3] | 21.0 |  |  |  |  | $ 1.0 |  |  |  |  |  |  | 20.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock activity |  | (3,324.0) |  |  |  |  |  |  |  |  |  |  |  | 3.0 |  |  |  |  |  |  |  |  |  |  |  | (3,327.0) |  |  |  |  |
Other |  | 3.0 |  |  |  |  |  |  |  |  | 3.0 |  |  | 62.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (62.0) |  |
Total Equity, Ending Balance at Dec. 31, 2019 |  | 49,343.0 | [1] | $ (671.0) | [5] | $ 48,672.0 | $ 2,712.0 | [1] | $ 2,712.0 | [1] | 3,993.0 | [1] | $ 3,993.0 | 12,376.0 | [1] | $ 12,376.0 | 42,215.0 | [1] | $ (671.0) |  | $ 41,544.0 | 799.0 | [1] |  | $ 799.0 | (12,781.0) | [1] | $ (12,781.0) | 29.0 | [1] | $ 29.0
Dividends, Cash [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock activity, shares |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value less than $.5 million at each date |  | $ 0.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock held in treasury at cost (shares) |  | 109,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock activity, shares |  |  |  |  |  |  | (9,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance, (in shares) at Dec. 31, 2020 |  |  |  |  |  |  | 424,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ 7,558.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,517.0 |  |  |  |  |  |  |  |  |  |  |  | 41.0 |  |
Other comprehensive income (loss), net of tax |  | 1,971.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,971.0 |  |  |  |  |  |  |  |  |
Dividends, Cash [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common |  | (1,980.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,980.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred |  | (229.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (229.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock discount accretion |  |  |  |  |  |  |  |  |  |  | 4.0 |  |  |  |  |  | (4.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock activity | [3] | 24.0 |  |  |  |  | $ 1.0 |  |  |  |  |  |  | 23.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock activity |  | (1,370.0) |  |  |  |  |  |  |  |  |  |  |  | 54.0 |  |  |  |  |  |  |  |  |  |  |  | (1,424.0) |  |  |  |  |
Other |  | (125.0) |  |  |  |  |  |  |  |  |  |  |  | (86.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (39.0) |  |
Preferred stock redemption - Series Q | [6] | (480.0) |  |  |  |  |  |  |  |  | (480.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Equity, Ending Balance at Dec. 31, 2020 |  | 54,041.0 |  |  |  |  | $ 2,713.0 |  |  |  | $ 3,517.0 |  |  | $ 12,367.0 |  |  | $ 46,848.0 |  |  |  |  | $ 2,770.0 |  |  |  | $ (14,205.0) |  |  | $ 31.0 |  |
Dividends, Cash [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock activity, shares | [3] |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value less than $.5 million at each date |  | $ 0.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock held in treasury at cost (shares) |  | 119,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | The par value of our preferred stock outstanding was less than $0.5 million at each date and, therefore, is excluded from this presentation.
[2] | Represents the cumulative effect of adopting ASU 2014-09, ASU 2016-01, ASU 2017-12 and ASU 2018-02.
[3] | Common stock activity totaled less than 0.5 million shares issued.
[4] | Represents the impact of the adoption of ASU 2016-02 related primarily to deferred gains on previous sale-leaseback transactions.
[5] | Represents the impact of the adoption ASU 2016-13 - Financial Instruments - Credit Losses. See the Recently Adopted Accounting Standards portion of Note 1 Accounting Policies in this Report for additional detail on this adoption.
[6] | On September 1, 2020, PNC redeemed all 4,800 shares of its Series Q Preferred Stock, as well as all 19.2 million Depositary Shares representing fractional interest in such shares

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