Pension, Other Postretirement Benefits and Savings Plans - Selected Pension Plan Information (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
UNITED STATES
All plans:
Accumulated benefit obligation	$ 5,780	$ 5,220
Plans not fully-funded:
Projected benefit obligation	1,847	5,235
Accumulated benefit obligation	1,829	5,220
Fair value of plan assets	1,674	4,970
Foreign Plan [Member]
All plans:
Accumulated benefit obligation	3,385	3,284
Plans not fully-funded:
Projected benefit obligation	1,273	933
Accumulated benefit obligation	1,216	856
Fair value of plan assets	$ 650	$ 185

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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

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

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