Shareholders' Equity - Shares Repurchased and Reissued (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jul. 24, 2023	Jan. 31, 2022
Equity, Class of Treasury Stock [Line Items]
Repurchase of common shares	$ 502	$ 477	$ 1,159	$ 1,056
Stock repurchase program, authorized amount						$ 3,000
Remaining balance under stock repurchase program	$ 600		$ 600
Reissuance of treasury stock (in shares)			0.6	0.7
Subsequent event
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount					$ 3,500
Common Stock Repurchases
Equity, Class of Treasury Stock [Line Items]
Repurchase of common shares (in shares)			3.2	3.2
Repurchase of common shares			$ 998	$ 887
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			$ 88	$ 91
Option Repurchases
Equity, Class of Treasury Stock [Line Items]
Repurchase of common shares (in shares)			0.2	0.2
Repurchase of common shares			$ 73	$ 75