Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Fair Value	$ 8,575	$ 8,113
Financing receivable, unearned income	$ 361	$ 368
Common shares, par value (in usd per share)	$ 1	$ 1
Common shares, shares authorized (in shares)	2,100,000,000	2,100,000,000
Common shares, shares issued (in shares)	1,256,702,081	1,256,702,081
Treasury stock, shares (in shares)	320,968,822	323,377,500
Residential Mortgage
Loans held for sale	$ 67	$ 24