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Other Intangible Assets Level 4 - Other Intangible Assets Gross/Net (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Finite-Lived Intangible Assets, Gross $ 29
Finite-Lived Intangible Assets, Accumulated Amortization 5
Finite-Lived Intangible Assets, Net $ 24
Finite-Lived Intangible Asset, Useful Life 5 years
Indefinite-lived Intangible Assets (Excluding Goodwill) $ 26
Intangible Assets, Gross (Excluding Goodwill) 55
Other Intangible Assets, Net $ 50