Benefit Plans (Accumulated Benefit Obligation) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	$ 188	$ 376
Information for pension plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	197	89
Accumulated benefit obligation	178	79
Fair value of plan assets	114	33
Information for pension plans with a projected benefit obligation in excess of plan assets:
Projected benefit obligation	224	220
Fair value of plan assets	129	150
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	1,224	1,101
Information for pension plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	1,242	1,118
Accumulated benefit obligation	1,224	1,101
Fair value of plan assets	1,154	1,026
Information for pension plans with a projected benefit obligation in excess of plan assets:
Projected benefit obligation	1,242	1,118
Fair value of plan assets	$ 1,154	$ 1,026