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Intangible Assets (Total Book Value of Intangible Assets ) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Notes to Consolidated Financial Statements [Abstract]    
Intangible assets having a defined useful life $ 318 $ 332
Intangible assets having an indefinite useful life 334 339
Total intangible assets $ 652 $ 671