Income Taxes, Schedule of Income Taxes Paid (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes Paid, Net
Income taxes paid, net	$ 1,361	$ 410	$ 444
U.S. [Member]
Income Taxes Paid, Net
Income taxes paid, net	1,016	239	241
International [Member]
Income Taxes Paid, Net
Income taxes paid, net	$ 345	$ 171	$ 203