Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
US Tax Reform, Provisional Tax Expense	$ 130
Income tax expense (benefit) at the U.S. federal tax rate of 35%	169	$ 133	$ (33)
Foreign income tax differential	(38)	(26)	33
U.S. permanent book/tax differences	2	0	(5)
Tax audit settlements	0	0	(10)
Change in liability for unrecognized tax benefits	(2)	(12)	(7)
Nondeductible transaction costs	0	0	(1)
Goodwill impairment	0	0	5
U.S. valuation allowance	0	0	(3)
US manufacturing deduction	(9)	(7)	0
Settlement of UK London pension plan	0	0	77
Tax extenders legislation		0	0
Employee Benefits and Share-based Compensation	(8)	0	0
Other, net	(2)	4	(1)
Total income tax expense (benefit)	$ 242	$ 92	$ 55