Stock Plans (Narrative) (Details) $ in Millions	9 Months Ended
Sep. 30, 2017 USD ($) performance_metric year shares	May 31, 2017 shares
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to non-vested stock awards \| $	$ 134
Award requisite service period	3 years
Minimum Retirement Age \| year	58
Stock awards vested during period (in shares)	1,999,045
Restricted Stock Units (RSUs) [Member] \| Grant Date Fair Value [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of vested stock awards \| $	$ 156
Restricted Stock Units (RSUs) [Member] \| Total Fair Value [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of vested stock awards \| $	206
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to non-vested stock awards \| $	$ 40
Minimum Retirement Age \| year	58
Stock awards vested during period (in shares)	0
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 PSUs will vest	100.00%
The number of shares of common stock issue for each vested PSU	1
Performance Shares [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	0.00%
Performance Shares [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	200.00%
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)	24,992,830
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%

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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.

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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.

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- Definition

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

+ References

No definition available.

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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

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
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-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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-Name Accounting Standards Codification
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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

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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
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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

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- Definition

Percentage of vesting of share-based compensation awards.

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