Pension and Postretirement Expense Level 4 (Details) - Estimated Future Plan Benefit Payments - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 29
Pension Plan [Member]
Defined Contribution Plan, Cost	6	$ 7	$ 17	$ 16
UNITED STATES | Pension Plan [Member]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	18
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	18
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	16
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	16
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	16
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	69
UNITED STATES | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	0
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	0
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	0
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	0
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	0
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	0
Foreign Plan [Member] | Pension Plan [Member]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	14
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	13
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	14
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	15
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	18
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	99
Foreign Plan [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	1
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	0
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	0
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	0
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	0
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	$ 3