Income Taxes, Components of Current and Deferred Portions of Provision for Income Taxes on Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current income tax provision [Abstract]
Federal	$ 30	$ 44	$ 88
State and local	18	10	8
Foreign	62	56	48
Subtotal	110	110	144
Deferred income tax provision/(benefit) [Abstract]
Federal	(7)	(16)	25
State and local	0	6	2
Foreign	0	2	0
Subtotal	(7)	(8)	27
Total provision for income taxes	$ 103	$ 102	$ 171