Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2026 USD ($) peerGroup $ / shares shares	Mar. 31, 2026 shares	Jun. 30, 2026 USD ($) peerGroup $ / shares shares	Jun. 30, 2025 shares	Dec. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for future issuance (in shares)	20,100,000		20,100,000
Granted (in shares)			0	0
Proceeds from stock options exercised | $	$ 3		$ 18
Stock option exercises, net (in shares)	113,611		806,451	0
Share price (in dollars per share) | $ / shares	$ 78.82		$ 78.82
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount from market price (as a percent)			15.00%	15.00%
Common stock shares reserved for future issuance (in shares)	9,600,000		9,600,000
Maximum percentage of shares purchased from annual compensation			10.00%
Discount given to employees (as a percent)			15.00%
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost | $	$ 189		$ 189
Weighted-average period unrecognized compensation cost is expected to be recognized, in years			2 years 7 months 6 days
Restricted stock | Below Manager Level | First Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage (as a percent)			33.00%
Restricted stock | Below Manager Level | Second Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage (as a percent)			33.00%
Restricted stock | At or Above Manager Level | First Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage (as a percent)			33.00%
Restricted stock | At or Above Manager Level | Second Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage (as a percent)			33.00%
PSUs | Three-Year Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost | $	$ 124		$ 124
Weighted-average period unrecognized compensation cost is expected to be recognized, in years			1 year 4 months 24 days
Performance period			3 years	3 years
Number of peer groups (in peer groups) | peerGroup	2		2
Performance-based long-term incentive program weighted percentage			50.00%
Maximum payout (as a percent)			100.00%
Additional units granted above target (in shares)		121,475
PSUs | Three-Year Program | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum payout (as a percent)			0.00%
PSUs | Three-Year Program | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum payout (as a percent)			200.00%
PSUs | Two-year PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional units granted above target (in shares)		87,460
PSUs | Officer | Two-year PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period			2 years		2 years
Vesting period/performance-based non-qualified stock options employment agreement.			1 year
PSUs | Officer | Two-year PSU | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum payout (as a percent)			0.00%
PSUs | Officer | Two-year PSU | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum payout (as a percent)			200.00%