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Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2026 USD ($) peerGroup $ / shares shares	Mar. 31, 2026 shares	Sep. 30, 2026 USD ($) peerGroup $ / shares shares	Sep. 30, 2025	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
Stock option exercises, net (in shares)	0		806,451
Proceeds from stock options exercised \| $			$ 18
Share price (in dollars per share) \| $ / shares	$ 92.01		$ 92.01
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 \| $	$ 169		$ 169
Weighted-average period unrecognized compensation cost is expected to be recognized, in years			2 years 3 months 18 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 \| $	$ 103		$ 103
Weighted-average period unrecognized compensation cost is expected to be recognized, in years			1 year 2 months 12 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 issued 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 issued 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%