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Common and Preferred Shares (Details) - shares
shares in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Equity [Abstract]      
Common shares, authorized (in shares) 3,600 3,600 3,600
Schedule Of Stock By Class [Roll Forward]      
Shares issued and outstanding at beginning of year (in shares) 805 810 847
Repurchases of common shares (in shares) (46) (7) (40)
Other, primarily stock option exercises and restricted stock awards granted (in shares) 2 2 3
Shares issued and outstanding as of December 31 (in shares) 761 805 810
Shares reserved for issuance under employee stock and employee benefit plans (in shares) 21