Shareholders' Equity - Share-based Compensation, Awards, Intrinsic Value, Cash Received and Tax Benefit (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Intrinsic Value - RSU and PS	$ 3	$ 3	$ 109
Cash Received	0	0	0
Tax Benefit - RSU and PS awards	1	1	33
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Intrinsic Value - RSU and PS	40	0	35
Cash Received	0	0	0
Tax Benefit - RSU and PS awards	12	0	12
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Intrinsic Value - Stock Options	0	3	14
Cash Received	0	9	19
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	$ 0	$ 1	$ 5

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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

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

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