Share-Based Associate Compensation Plans (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) peers_exceeded Peers compensation_plans shares	Dec. 31, 2022 USD ($) Peers peers_exceeded shares	Dec. 31, 2021 USD ($) peers_exceeded Peers shares
Share-based Compensation Arrangement by Share-based Payment Award
Number of equity compensation plans | compensation_plans	3
Maximum number of shares awarded to each full-time employee for their service | shares	10
Share based compensation cost after tax	$ 32	$ 29	$ 26
Tax benefit from compensation expense	8	7	6
Options exercised, intrinsic value	14	21	24
Options vested, intrinsic value	0	2	15
Unrecognized compensation costs related to non-vested awards	$ 43
Expected weighted-average period to recognize the unrecognized compensation costs related to non-vested awards	1 year 9 months 18 days
Proceeds from stock options exercised	$ 9	10	13
Shares of common stock granted in period (in shares) | shares	384,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Awards exercise peirod	10 years
Awards vesting period	3 years
Proceeds from stock options exercised	$ 9	$ 10	$ 13
Shares repurchased | shares	72,549	80,538	77,947
Shares repurchased, value	$ 8	$ 10	$ 8
Weighted average remaining contractual term	8 years 5 months 12 days
Shares authorized to be granted under the shareholder-approved plans | shares	10,300,000
Shares available for future issuance under the plans | shares	3,600,000
Stock Options | Directors
Share-based Compensation Arrangement by Share-based Payment Award
Shares of common stock granted in period (in shares) | shares	11,524
Performance Shares | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Number of peers exceeded | peers_exceeded	2	1	6
Number of peers in peer group | Peers	8	8	9
Shares, Issued | shares	0	52,335
Awards vesting period	3 years	3 years
Risk-free rates, minimum	0.00%	0.00%	0.00%
Risk-free rates, maximum	200.00%	200.00%	200.00%
share based performance metric for performance shares	3 years
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Intrinsic Value Aggregate		$ 6	$ 11
Service Based Shares | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Awards vesting period	3 years
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Intrinsic Value Aggregate	$ 22	$ 32	$ 26