Stock Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, in years	3 years
Expense amortization period	3 years
Pre-tax compensation expense	$ 50	$ 47	$ 41
Deferred tax benefit	12	12	10
Unamortized compensation expense	$ 86
Weighted-average period of recognition, in years	2 years
Weighted-average grant date fair value	$ 67	$ 56	$ 59
Weighted-average grant date fair value, per share (in USD per share)	$ 43.29	$ 46.38	$ 49.22
Total fair value vested	$ 35	$ 40	$ 29
Granted, number of shares (in shares)	1,546,213
Number of shares remaining (in shares)	3,973,485	3,472,801
Grant date fair value (in USD per share)	$ 45.87	$ 46.84
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, in years	3 years
Pre-tax compensation expense	$ 6	$ 11	$ 9
Unamortized compensation expense	$ 13
Granted, number of shares (in shares)	290,980	255,601	215,205
Number of shares remaining (in shares)	750,826
Grant date fair value (in USD per share)	$ 46.87
Common Stock [Member] | 2020 Performance Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares issuable under the stock compensation plan (in shares)	25,000,000
Shares available to be granted (in shares)	18,507,747
Common Stock [Member] | 2015 Directors Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares issuable under the stock compensation plan (in shares)	1,000,000
Shares available to be granted (in shares)	533,843