Pension and Postretirement Benefits (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Defined Benefit and Defined Contribution Plan Disclosure [Line Items]
Pension and Other Postretirement Benefits Cost	$ 25	$ 21

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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