Retirement Programs - Plans Where the ABO Exceeds Plan Assets Fair Value (Details) - Pensions - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
U.S.
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation (PBO)	$ 2,552	$ 2,139
Accumulated benefit obligation (ABO)	2,464	2,060
Fair value of plan assets	2,048	1,482
International
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation (PBO)	7,768	6,681
Accumulated benefit obligation (ABO)	7,664	6,586
Fair value of plan assets	$ 5,849	$ 5,307

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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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