Goodwill Schedule of Finite-Lived Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

amortization expense for the subsequent five years is estimated as follows (dollars in millions): 

Period	Amount
2019	$	60
2020	46
2021	27
2022	17
2023	14