Income Tax (Pre-tax Income Foreign and Domestic) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Domestic									$ 327	$ 79	$ 871
Income (Loss) from Continuing Operations before Income Taxes, Foreign									364	474	261
Income before income taxes	$ 57	$ (34)	$ 482	$ 186	$ 169	$ 285	$ 195	$ (96)	$ 691	$ 553	$ 1,132