Benefit Plans and Other Postretirement Benefits Plan Amendments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Contribution Plan, Administrative Expense	$ 12	$ 12	$ 11
plan amendments		$ 0	$ 0

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