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Consolidated Balance Sheets (Parenthetical) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Held-to-maturity securities, fair value | $ 10,116,000,000 | $ 11,122,000,000
Unearned income on loans | 603,000,000 | 678,000,000
Aggregate amount of certificates of deposit, denominations | $ 100,000 | $ 100,000
Common shares, par value (in dollars per share) | $ 1 | $ 1
Common shares, shares authorized (in shares) | 2,100,000,000 | 1,400,000,000
Common shares, shares issued (in shares) | 1,256,702,081 | 1,256,702,081
Treasury stock (in shares) | 279,513,530 | 237,198,944
Residential Mortgage [Member] |  |
Loans held for sale | $ 140,000,000 | $ 54,000,000

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- Definition Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84165051&loc=d3e45377-112738 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159169&loc=d3e10152-111534 + Details
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