Income Tax (Income Loss from Continuing Operations Before Income Tax Expense from Domestic and Foreign Operations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income (loss) from continuing operations:
U.S.	$ 2,970	$ 2,094	$ (803)
Non-U.S.	3,957	4,701	7,110
Income (loss) before provision for income tax	$ 6,927	$ 6,795	$ 6,307