Stock Plans (Narrative) (Details) $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($) performance_metric year shares	May 31, 2017 shares
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	0.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	200.00%
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award requisite service period	3 years
Minimum retirement age \| year	58
Unamortized compensation cost related to restricted stock and deferred stock awards \| $	$ 108
Weighted-average recognition period	2 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award requisite service period	3 years
Minimum retirement age \| year	58
Unamortized compensation cost related to restricted stock and deferred stock awards \| $	$ 34
Weighted-average recognition period	2 years
Performance period	3 years
Number of performance metrics used to determine the percentage of PSU's that will vest \| performance_metric	3
Aggregate weighted performance factor that determines if the target number of PSU's will vest	100.00%
Number of shares of common stock issued for each vested PSU	1
2017 Performance Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated common stock to be awarded under a stock benefit plan, maximum limit (in shares)		25,000,000
Shares available for grant under the plan (in shares)	24,991,850
2017 Non Employee Directors Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated common stock to be awarded under a stock benefit plan, maximum limit (in shares)		1,000,000
Shares available for grant under the plan (in shares)	1,000,000
Percentage of voting shares that PMI may own, used in determining non-employee director status		50.00%

Minimum Retirement Age

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- Definition

Represents the lower limit of ownership in a company by PMI used in defining Non-employee directors under the stock compensation plan.

+ References

No definition available.

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- Definition

Performance Metrics Predefined at Time of Grant, including Market and Non-Market Metrics, used by the Company to Determine the Percentage of PSU's that will Vest

+ References

No definition available.

+ Details

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- Definition

Share-Based Compensation Arrangement by Share-Based Payment Award, Duration of the Performance Cycle that Requires the Achievement of Predefined Performance Metrics

+ References

No definition available.

+ Details

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- Definition

Share-Based Compensation by Share-Based Payment Awards, the Aggregate Weighted Performance Factor that Results in the Vesting of the Targeted Number of Performance Share Units

+ References

No definition available.

+ Details

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- Definition

The Number of shares of Common Stock Issued for each Vested Performance Share Unit

+ References

No definition available.

+ Details

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ 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 (a)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

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

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- Definition

Percentage of vesting of share-based compensation awards.

+ 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 (a)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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