Common and Preferred Shares - Common Shares (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
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)	702	723	743
Repurchases of common shares (in shares)	(17)	(24)	(22)
Net shares issued for RSUs and stock option exercises (in shares)	2	3	2
Shares issued and outstanding as of December 31 (in shares)	686	702	723
Shares reserved for issuance under employee stock and employee benefit plans (in shares)	25