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Intangible Assets (Total Book Value of Intangible Assets ) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Notes to Consolidated Financial Statements [Abstract]    
Intangible assets having a defined useful life $ 317 $ 318
Intangible assets having an indefinite useful life 353 334
Total intangible assets $ 670 $ 652