Fair Value Measurements and Derivative Instruments (Concentrations of Credit Risk) (Details) - USD ($) $ in Millions |
12 Months Ended | |
---|---|---|
Dec. 31, 2023 |
Dec. 31, 2022 |
|
Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||
Derivative instrument, credit risk exposure | $ 125 | $ 103 |