Income Taxes Level 4 (Details) - Unrecognized Tax Benefits - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Jul. 01, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	$ 133	$ 94	$ 80
Additions based on tax positions related to the current year	2	41	4
Additions for tax positions of prior years	0	5	16
Reductions for tax positions of prior years	(3)	(6)	(2)
Settlements	(4)	0	0
Foreign currency translation	2	(1)	(4)
Balance at end of period	130		94	$ 80
Unrecognized Tax Benefits, Period Increase (Decrease)	1
Income Tax Examination, Penalties Expense	2	$ 3	3	$ 5
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	56		$ 51		$ 0
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	130
Maximum [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Amount of Unrecognized Tax Benefits Expected to Be Recognized within the Next 12 Months	$ 22