Benefit Plans Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 92	[1]	$ 85	[1]	$ 72
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan assets	1		1
Equity securities: Equity commingled funds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	36		31
Debt securities: Government bonds
Defined Benefit Plan Disclosure [Line Items]
Plan assets	45		43
Other investments
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 10		$ 10

[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.