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Pension and Other Postretirement Employee Benefit Plans - Schedule of Fair Values of Plan Assets (Details) - USD ($) $ in Billions	Mar. 31, 2021	Dec. 31, 2020
Pension plans \| U.S.
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 16.9	$ 17.6
OPEB plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 7.6	$ 7.8

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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