Indebtedness (Credit Facilities) (Details) - USD ($)		Oct. 01, 2020	Dec. 31, 2016	Jan. 27, 2016
Line of Credit Facility [Line Items]
Committed Credit Facilities			$ 8,000,000,000
Commercial Paper			0
364-day revolving credit, expiring February 7, 2017 [Member]
Line of Credit Facility [Line Items]
Committed Credit Facilities			2,000,000,000	$ 2,000,000,000
Multi-year revolving credit, expiring February 28, 2021 [Member]
Line of Credit Facility [Line Items]
Committed Credit Facilities			2,500,000,000	$ 2,500,000,000
Multi-year revolving credit, expiring October 1, 2020 [Member]
Line of Credit Facility [Line Items]
Committed Credit Facilities	[1]		$ 3,500,000,000
Multi-year revolving credit, expiring October 1, 2021 [Member] | Scenario, Forecast [Member]
Line of Credit Facility [Line Items]
Committed Credit Facilities		$ 3,350,000,000.00

[1] On August 30, 2016, PMI entered into an agreement, effective October 1, 2016, to extend the term of its multi-year revolving credit facility, for an additional year covering the period October 1, 2020, to October 1, 2021, in the amount of $3.35 billion.