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Goodwill and Other Intangibles (Other Intangible Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
Intangible amortization $ 62 $ 69 $ 75