Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Impairment of goodwill		$ 43	$ 0	$ 0
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	[1]	(21)	0
Amortizing Intangible Assets, Amortization Expense		(68)	(67)
Continuing Operations [Member]
Goodwill [Line Items]
Amortizing Intangible Assets, Amortization Expense		(68)	$ (67)	$ 65
Other U.S. [Member]
Goodwill [Line Items]
Impairment of goodwill		17
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	[1]	$ 12

[1] (1) $12 million recognized in our Other U.S. segment and $9 million recognized in our All Other segment.