Benefit Plans (Accumulated Benefit Obligation) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	$ 199	$ 188
Information for pension plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	218	197
Accumulated benefit obligation	199	178
Fair value of plan assets	112	114
Information for pension plans with a projected benefit obligation in excess of plan assets:
Projected benefit obligation	218	224
Fair value of plan assets	112	129
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	1,306	1,224
Information for pension plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	494	1,242
Accumulated benefit obligation	481	1,224
Fair value of plan assets	403	1,154
Information for pension plans with a projected benefit obligation in excess of plan assets:
Projected benefit obligation	494	1,242
Fair value of plan assets	$ 403	$ 1,154