Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets - Narrative (Details)

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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]          
Goodwill and intangible asset impairment $ 271 $ 271 $ 0 $ 0 $ 0
Goodwill impairment 259 $ 259      
Intangible asset impairment $ 12