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Goodwill and Other Intangible Assets - Schedule of estimated future amortization expense on intangible assets (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2019 $ 385
2020 219
2021 126
2022 84
2023 72
Thereafter 263
Total future amortization of intangible assets $ 1,149