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Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets (Intangible Amortization) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Amortization, 2017 $ 58
Amortization, 2018 57
Amortization, 2019 55
Amortization, 2020 48
Amortization, 2021 28
Amortization, thereafter 181
Net Book Value 427
Interest, 2017 2
Interest, 2018 2
Interest, 2019 0
Interest, 2020 0
Interest, 2021 0
Interest, thereafter 0
Total $ 4