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Goodwill and Other Intangible Assets - Schedule of estimated future amortization expense on intangible assets (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2018 $ 410
2019 420
2020 253
2021 140
2022 98
Thereafter 412
Total future amortization of intangible assets $ 1,733