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Description of the Business and Basis of Presentation - Summarized Income Statement Data (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]      
Operating revenues $ 922 $ 920 $ 840
Net Income 396 382 318
Equity method investment, non-consolidated investees      
Schedule of Equity Method Investments [Line Items]      
Operating revenues 823 800 738
Operating expenses 377 396 371
Net Income $ 392 $ 372 $ 333