Income Taxes, Income from Continuing Operations Before Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Estimated tax benefit amount	$ 1	$ 79
Cumulative tax benefit amount	80
Benefit amount from remeasurement of deferred tax assets	98
Estimated toll charge	18
Domestic	630	649	$ 608
Foreign	294	222	196
Income from continuing operations before income taxes	$ 924	$ 871	$ 804