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Shareholders' Equity - Share-based Compensation, Stock Option Awards, Intrinsic Value (Details) - Stock Options [Member]
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Aggregate intrinsic value outstanding $ 1
Aggregate intrinsic value exercisable $ 1
Weighted-average remaining contractual life, outstanding, years 7 months
Weighted-average remaining contractual life, exercisable, years 7 months