Benefit Plans - Pension Plans Resulted in Net Pension Asset (Liability) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Prepaid pension assets	$ 1,009	$ 672
Accrued pension costs	(681)	(1,257)
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Prepaid pension assets	1,009	672
Other current liabilities	(31)	(29)
Accrued pension costs	(681)	(1,257)
Net pension liability	297	(614)
Pension Plans | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	42	51
Accumulated benefit obligation	42	51
Fair value of plan assets	3	3
Pension Plans | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	1,889	4,059
Accumulated benefit obligation	1,805	3,873
Fair value of plan assets	$ 1,223	$ 2,827