Fair Value of Financial Instruments (Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($)	Jun. 30, 2026	Dec. 31, 2025
Debt Securities [Abstract]
Financial investments	$ 198,000,000	$ 28,000,000
Total assets at fair value	0	0
Fair value, recurring
Debt Securities [Abstract]
Financial investments	198,000,000	28,000,000
Equity securities	8,000,000	25,000,000
Total assets at fair value	206,000,000	53,000,000
Fair value, recurring | Level 1
Debt Securities [Abstract]
Financial investments	198,000,000	28,000,000
Equity securities	8,000,000	25,000,000
Total assets at fair value	206,000,000	53,000,000
Fair value, recurring | Level 2
Debt Securities [Abstract]
Financial investments	0	0
Equity securities	0	0
Total assets at fair value	0	0
Fair value, recurring | Level 3
Debt Securities [Abstract]
Financial investments	0	0
Equity securities	0	0
Total assets at fair value	0	0
Fair value, recurring | European government debt securities
Debt Securities [Abstract]
Financial investments	198,000,000	28,000,000
Fair value, recurring | European government debt securities | Level 1
Debt Securities [Abstract]
Financial investments	198,000,000	28,000,000
Fair value, recurring | European government debt securities | Level 2
Debt Securities [Abstract]
Financial investments	0	0
Fair value, recurring | European government debt securities | Level 3
Debt Securities [Abstract]
Financial investments	$ 0	$ 0