Stock Compensation (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants (in shares)	13,500
Total compensation expense for option grants, Restricted Stock Awards and PSU's	$ 112	$ 147	$ 161
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
The weighted-average remaining contractual term of options outstanding	2 years
The weighted-average remaining contractual term of options exercisable	2 years
The aggregate intrinsic value of options outstanding (in dollars)	$ 59
The aggregate intrinsic value of options exercisable (in dollars)	59
The total intrinsic values of options exercised (in dollars)	20	117	37
Cash proceeds received from options exercised (in dollars)	$ 20	$ 90	$ 64
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Restricted Stock Awards And PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares or units granted as Restricted Stock Awards and PSUs (in shares)	1,663	2,300	2,700
Total unrecognized compensation expense	$ 91
Period during which unrecognized compensation expense is expected to be recognized	3 years
Amount to be recognized as compensation expense year 1	$ 58
Amount to be recognized as compensation expense year 2	30
Amount to be recognized as compensation expense year 3	$ 3
Weighted average grant-date fair value of Restricted Stock Awards and PSU's, Granted (in dollars per share)	$ 78.90	$ 70.13	$ 53.28
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Total fair value of Restricted Stock Awards vested during the period	$ 153
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	33.33%
Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Minimum [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Maximum [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years