Financing (2025 Debt Issuances) (Details) - Subsequent event $ in Millions	Oct. 10, 2025 USD ($)
2027 CHF Bonds
Debt Instrument [Line Items]
Aggregate principal amount	$ 250
Stated Annual Interest Rate	0.4773%
2029 CHF Bonds
Debt Instrument [Line Items]
Aggregate principal amount	$ 325
Stated Annual Interest Rate	0.8875%
2033 CHF Bonds
Debt Instrument [Line Items]
Aggregate principal amount	$ 325
Stated Annual Interest Rate	1.265%
2037 CHF Bonds
Debt Instrument [Line Items]
Aggregate principal amount	$ 225
Stated Annual Interest Rate	1.6249%
2045 CHF Bonds
Debt Instrument [Line Items]
Aggregate principal amount	$ 125
Stated Annual Interest Rate	1.94%
Total Swiss Bonds
Debt Instrument [Line Items]
Aggregate principal amount	$ 1,250