Employee Benefit Plans - Information for Plans with ABOs and PBOs in Excess of Plan Assets (Details) - Pension Benefits - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Projected benefit obligation	$ 1,476	$ 3,390
Accumulated benefit obligation	1,423	3,340
Fair value of plan assets	964	2,772
Projected benefit obligation	1,476	3,390
Accumulated benefit obligation	1,423	3,340
Fair value of plan assets	$ 964	$ 2,772

Amount of accumulated benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets.

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Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets.

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