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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Other indefinite-lived intangible assets $ 200 $ 140
Carrying value of definite-lived intangible assets 229 47
Accumulated amortization $ 13 $ 10