Fair Value of Financial Instruments (Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Debt Securities [Abstract]
Financial investments	$ 197	$ 181
Fair Value, Measurements, Recurring
Debt Securities [Abstract]
Financial investments	197	181
Fair Value, Measurements, Recurring | Level 1
Debt Securities [Abstract]
Financial investments	110	147
Fair Value, Measurements, Recurring | Level 2
Debt Securities [Abstract]
Financial investments	87	34
Fair Value, Measurements, Recurring | Level 3
Debt Securities [Abstract]
Financial investments	0	0
Fair Value, Measurements, Recurring | European government debt securities
Debt Securities [Abstract]
Financial investments	110	147
Fair Value, Measurements, Recurring | European government debt securities | Level 1
Debt Securities [Abstract]
Financial investments	110	147
Fair Value, Measurements, Recurring | European government debt securities | Level 2
Debt Securities [Abstract]
Financial investments	0	0
Fair Value, Measurements, Recurring | European government debt securities | Level 3
Debt Securities [Abstract]
Financial investments	0	0
Fair Value, Measurements, Recurring | State-owned enterprises and municipal securities
Debt Securities [Abstract]
Financial investments	62	7
Fair Value, Measurements, Recurring | State-owned enterprises and municipal securities | Level 1
Debt Securities [Abstract]
Financial investments	0	0
Fair Value, Measurements, Recurring | State-owned enterprises and municipal securities | Level 2
Debt Securities [Abstract]
Financial investments	62	7
Fair Value, Measurements, Recurring | State-owned enterprises and municipal securities | Level 3
Debt Securities [Abstract]
Financial investments	0	0
Fair Value, Measurements, Recurring | Corporate debt securities
Debt Securities [Abstract]
Financial investments	5	7
Fair Value, Measurements, Recurring | Corporate debt securities | Level 1
Debt Securities [Abstract]
Financial investments	0	0
Fair Value, Measurements, Recurring | Corporate debt securities | Level 2
Debt Securities [Abstract]
Financial investments	5	7
Fair Value, Measurements, Recurring | Corporate debt securities | Level 3
Debt Securities [Abstract]
Financial investments	0	0
Fair Value, Measurements, Recurring | Swedish mortgage bonds
Debt Securities [Abstract]
Financial investments	20	20
Fair Value, Measurements, Recurring | Swedish mortgage bonds | Level 1
Debt Securities [Abstract]
Financial investments	0	0
Fair Value, Measurements, Recurring | Swedish mortgage bonds | Level 2
Debt Securities [Abstract]
Financial investments	20	20
Fair Value, Measurements, Recurring | Swedish mortgage bonds | Level 3
Debt Securities [Abstract]
Financial investments	$ 0	$ 0