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Premises, Equipment and Leasehold Improvements | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Premises, Equipment and Leasehold Improvement | PREMISES, E QUIPMENT AND L EASEHOLD I MPROVEMENTSPremises, equipment and leasehold improvements, stated at cost less accumulated depreciation and amortization, were as follows: Table 71: Premises, Equipment and Leasehold Improvements
In millions | December 31 2020 |  | December 31 2019 |
Premises, equipment and leasehold improvements | $ | 14,843 |  |  | $ | 14,681 |  |
Accumulated depreciation and amortization | (7,156) |  |  | (6,953) |  |
Net book value | $ | 7,687 |  |  | $ | 7,728 |  |
Depreciation expense on premises, equipment and leasehold improvements, as well as amortization expense, excluding intangible assets, primarily for capitalized internally developed software are shown in the following table: Table 72: Depreciation and Amortization Expense
Year ended December 31 In millions | 2020 |  | 2019 |  | 2018 |
Depreciation | $ | 791 |  |  | $ | 778 |  |  | $ | 754 |  |
Amortization | 115 |  |  | 109 |  |  | 78 |  |
Total depreciation and amortization | $ | 906 |  |  | $ | 887 |  |  | $ | 832 |  |

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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