Benefit Plans (Amounts Recognized in the Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Foreign Plan [Member]
AMOUNTS RECOGNIZED ON THE CONSOLIDATED BALANCE SHEETS
Noncurrent assets	$ 64	$ 69
Accrued benefit liability—current	(6)	(6)
Accrued benefit liability—noncurrent	(65)	(78)
Net amount recognized at end of year	(7)	(15)
UNITED STATES
AMOUNTS RECOGNIZED ON THE CONSOLIDATED BALANCE SHEETS
Noncurrent assets	0	0
Accrued benefit liability—current	0	0
Accrued benefit liability—noncurrent	(92)	(130)
Net amount recognized at end of year	$ (92)	$ (130)