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Shareholders' Equity - Share-based Compensation, Awards, Intrinsic Value, Cash Received and Tax Benefit (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Intrinsic Value	$ 20	$ 3	$ 1
Cash Received	0	0	0
Tax Benefit - RSU and PS awards	4	1	0
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Intrinsic Value	18	25	0
Cash Received	0	0	0
Tax Benefit - RSU and PS awards	4	10	0
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Intrinsic Value - Stock Options	2	3	3
Cash Received	2	6	9
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	$ 0	$ 1	$ 1

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Employee Service Share-based Compensation, Tax Benefit from vested awards.

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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