Shareholders' Equity - Share-based Compensation, Awards, Intrinsic Value, Cash Received and Tax Benefit (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Intrinsic Value	$ 85	$ 91	$ 117
Cash Received	0	0	0
Tax Benefit - RSU and PS awards	26	30	33
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Intrinsic Value	30	62	0
Cash Received	0	0	0
Tax Benefit - RSU and PS awards	10	22	0
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Intrinsic Value - Stock Options	42	51	12
Cash Received	55	124	44
Tax Benefit - Stock Options	$ 15	$ 19	$ 4

Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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

+ References

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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)

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

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