Benefit Plans (Amounts Recognized in the Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Foreign Plan [Member]
AMOUNTS RECOGNIZED ON THE CONSOLIDATED BALANCE SHEETS
Noncurrent assets	$ 0	$ 0
Accrued benefit liability—current	(8)	(7)
Accrued benefit liability—noncurrent	(98)	(88)
Net amount recognized at end of year	(106)	(95)
UNITED STATES
AMOUNTS RECOGNIZED ON THE CONSOLIDATED BALANCE SHEETS
Noncurrent assets	9	0
Accrued benefit liability—current	0	0
Accrued benefit liability—noncurrent	(91)	(88)
Net amount recognized at end of year	$ (82)	$ (88)