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Pension and Other Postretirement Benefits - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 24	$ 55		$ 271
Settlement charge		$ 1,511
Forecast
Defined Benefit Plan Disclosure [Line Items]
Employer contributions			$ 175

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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