Income Taxes - Schedule of Income Tax (Benefit) Expense Allocated to Continuing Operations and Amounts Separately Allocated to Other Items (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax (benefit) expense	$ 238	$ (134)	$ 244
Cash flow hedge in accumulated other comprehensive income (loss)	(2)	5	(2)
Net investment hedge in accumulated other comprehensive income (loss)	101	(13)	12
Pension liability in accumulated other comprehensive income (loss)	0	(2)	(2)
Stock option tax benefit in common shares	0	0	(9)
Total	$ 337	$ (144)	$ 243