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Other Intangible Assets Level 4 - Other Intangible Assets Gross and Net (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Finite-Lived Intangible Assets, Gross $ 29
Finite-Lived Intangible Assets, Accumulated Amortization 15
Finite-Lived Intangible Assets, Net $ 14
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 $ 40