Pension, Other Postretirement Benefits and Savings Plans - Selected Pension Plan Information (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
United States
All plans:
Accumulated benefit obligation	$ 4,994	$ 4,725
Plans not fully-funded:
Projected benefit obligation	5,009	4,732
Accumulated benefit obligation	4,994	4,723
Fair value of plan assets	4,780	4,443
Non-U.S.
All plans:
Accumulated benefit obligation	3,097	2,688
Plans not fully-funded:
Projected benefit obligation	1,059	908
Accumulated benefit obligation	991	852
Fair value of plan assets	$ 370	$ 281

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

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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 plan asset 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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