Benefit Plans Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 86	[1]	$ 78	[1]	$ 92
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1		2
Equity securities: Equity commingled funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	34		29
Debt securities: Government bonds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	40		38
Other investments
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 11		$ 9

[1] Fair values are determined based on valuation inputs categorized as Level 1, 2 or 3 (see Note 3. Significant Accounting Policies—Fair Value). Investment plan assets are valued using Level 1 or Level 2 inputs.