Pension and Postretirement Expense Level 4 (Details) - Amounts in Accumulated Other Comprehensive Income Expected to be Recognized in Next 12 Months - Other Postretirement Benefits Plan [Member] - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
UNITED STATES
Interest cost	$ 0	$ 0	$ 0	$ 0
Foreign Plan [Member]
Interest cost	$ 0	$ 0	$ 1	$ 1