Shareholders' Equity - Shares Repurchased and Reissued (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Jan. 31, 2022
Equity, Class of Treasury Stock [Line Items]
Repurchase of common shares	$ 657	$ 579
Stock repurchase program, authorized amount			$ 3,000
Remaining balance under stock repurchase program	$ 1,100
Reissuance of treasury stock (in shares)	0.6	0.5
Common Stock Repurchases
Equity, Class of Treasury Stock [Line Items]
Repurchase of common shares (in shares)	1.6	1.4
Repurchase of common shares	$ 506	$ 429
Restricted Stock Units Repurchases
Equity, Class of Treasury Stock [Line Items]
Repurchase of common shares (in shares)	0.3	0.3
Repurchase of common shares	$ 87	$ 89
Option Repurchases
Equity, Class of Treasury Stock [Line Items]
Repurchase of common shares (in shares)	0.2	0.2
Repurchase of common shares	$ 63	$ 62