Share-Based Compensation - Stock option activity (Details) - Stock Options $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) $ / shares shares
Number of Options / SARs
Outstanding, beginning of year (in shares) | shares	14,420,901
Granted (in shares) | shares	479,760
Exercised (in shares) | shares	(2,355,729)
Forfeited or expired (in shares) | shares	(8,339)
Outstanding, end of year (in shares) | shares	12,536,593
Exercisable, end of year (in shares) | shares	11,205,102
Weighted Average Exercise Price
Outstanding, beginning of year, weighted average exercise price | $ / shares	$ 28.17
Granted, weighted average exercise price | $ / shares	69.24
Exercised, weighted average exercise price | $ / shares	20.66
Forfeited or expired, weighted average exercise price | $ / shares	48.38
Outstanding, end of year, weighted average exercise price | $ / shares	31.14
Exercisable, end of year, weighted average exercise price | $ / shares	$ 28.68
Weighted average contractual term, outstanding, end of year	4 years 1 month 6 days
Weighted average contractual term, exercisable, end of year	3 years 7 months 9 days
Aggregate intrinsic value, outstanding, end of year | $	$ 541
Aggregate intrinsic value, exercisable, end of year | $	$ 511