Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Amortization of Intangible Assets	$ 54	$ 45	$ 47
Goodwill	1,061	1,059
Goodwill	$ 3,672	$ 3,670