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Pension and Postretirement Benefit Plans and Defined Contribution Plans - Amounts Expected to be Amortized into Net Periodic Benefit Costs (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Postretirement Benefits Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actuarial losses | $ (4) | [1]
Prior service credits and other | 178 |
Total | $ 175 |
Amortization period | 9 years 3 months 18 days |
United States [Member] | Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actuarial losses | $ (148) | [1]
Prior service credits and other | 3 |
Total | $ (145) |
Amortization period | 24 years 2 months 12 days |
United States [Member] | U.S. Supplemental (Non-Qualified) Pension Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actuarial losses | $ (9) | [1]
Prior service credits and other | 1 |
Total | $ (9) |
Amortization period | 25 years 3 months 18 days |
Foreign Plan [Member] | Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actuarial losses | $ (81) | [1]
Prior service credits and other | 3 |
Total | $ (78) |
Amortization period | 20 years |
[1] | Due to the U.S. Pfizer Consolidated Pension Plan freeze effective for January 1, 2018, the average amortization period for the U.S. qualified plans and U.S. supplemental (non-qualified) plans reflect the expected life expectancy of the plan participants, whereas prior years utilized the expected future service period of plan participants. The average amortization periods to be utilized for 2019 are 24.2 years for our U.S. qualified plans, 25.3 years for our U.S. supplemental (non-qualified) plans, 20 years for our international plans, and 9.3 years for our postretirement plans.

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- Definition Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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