Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2023

Equity Incentive Plans [Abstract]

Schedule of Equity Awards

Equity awards
($ in millions)	2023		2022		2021
Compensation expense	$	73	$	93	$	120
Income tax benefits	12		16		18
Cash received from exercise of options	103		130		151
Tax benefit realized on options exercised and release of stock restrictions	31		44		37

Schedule of Nonvested Awards

Nonvested awards as of December 31, 2023
($ in millions)	Unrecognized compensation		Weighted average vesting period
Nonqualified stock options	$	17	1.68
Restricted stock units	48		1.74
Performance stock awards	17		1.69
Total	$	82

Schedule of Option Grant Assumptions

Option grant assumptions
	2023		2022		2021
Weighted average expected term	5.8 years		5.9 years		7.5 years
Expected volatility	20.0% - 31.6%		19.8% - 29.9%		16.5% - 28.8%
Weighted average volatility	24.9	%	23.2	%	23.0	%
Expected dividends	2.4% - 3.3%		2.5% - 3.0%		2.0% - 3.0%
Weighted average expected dividends	2.6	%	2.8	%	3.1	%
Risk-free rate	3.3% - 5.6%		0% - 4.8%		0% - 1.7%

Schedule of Option Activity

Summary of option activity
	For the year ended December 31, 2023
	Number (in 000s)	Weighted average exercise price		Aggregate intrinsic value (in 000s)		Weighted average remaining contractual term (years)
Outstanding as of January 1, 2023	8,953	$	95.72
Granted	910	136.63
Exercised	(1,499)	80.27
Forfeited	(170)	124.26
Expired	(67)	117.79
Outstanding as of December 31, 2023	8,127	102.37		$	305,666	5.2
Outstanding, net of expected forfeitures	8,091	102.24		305,369		5.2
Outstanding, exercisable (“vested”)	6,146	95.05		276,112		4.3

Schedule of Changes in Restricted Stock Units

Changes in restricted stock units
	For the year ended December 31, 2023
	Number (in 000s)	Weighted average grant date fair value
Nonvested as of January 1, 2023	929	$	110.75
Granted	417	132.65
Vested	(371)	117.28
Forfeited	(73)	124.84
Nonvested as of December 31, 2023	902	117.05

Schedule of Changes in Performance Stock Awards

Changes in performance stock awards
	For the year ended December 31, 2023
	Number (in 000s)	Weighted average grant date fair value
Nonvested as of January 1, 2023	796	$	116.36
Granted	240	136.62
Adjustment for performance achievement	54	123.72
Vested	(309)	122.47
Forfeited	(47)	120.53
Nonvested as of December 31, 2023	734	120.68