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Goodwill And Other Intangible Assets - Narrative (Details)
$ in Millions
Mar. 31, 2018
USD ($)
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]  
Amortization expense relating to amortizable intangible assets, remainder of 2018 $ 125
Amortization expense relating to amortizable intangible assets, 2019 140
Amortization expense relating to amortizable intangible assets, 2020 134
Amortization expense relating to amortizable intangible assets, 2021 103
Amortization expense relating to amortizable intangible assets, 2022 84
Amortization expense relating to amortizable intangible assets, 2023 $ 57