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Income Taxes (Narrative) (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit) |  | $ 3,367,000,000 |  |  |  |  |  |  |
Unrecognized tax benefits if recognized would impact effective tax rate |  | 43,000,000 |  |  |  | $ 43,000,000 | $ 67,000,000 |  |
Unrecognized tax benefits if recognized would affect deferred taxes |  | 23,000,000 |  |  |  | 23,000,000 | 102,000,000 |  |
Interest (income) expense associated with uncertain tax position |  |  |  |  |  | (13,000,000) | 9,000,000 | $ (36,000,000) |
Potential decrease in liability for uncertain tax positions |  | 5,000,000 |  |  |  | $ 5,000,000 |  |  |
Effective income tax rate reconciliation, change in enacted tax rate, amount |  | 3,017,000,000 |  |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017, measurement period adjustment, income tax benefit |  | 763,000,000 |  |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017, transition tax for accumulated foreign earnings, income tax expense |  | 413,000,000 |  |  |  |  |  |  |
Foreign tax credits and other tax benefits, tax expense |  |  |  |  |  |  | $ 4,900,000,000 |  |
Income tax rate |  |  |  |  |  | 35.00% | 35.00% | 35.00% |
Tax (benefit) provision recorded |  |  | $ 232,000,000 | $ 24,000,000 |  |  |  | $ (59,000,000) |
Unrecognized tax benefits |  | 66,000,000 |  | 158,000,000 |  | $ 66,000,000 | $ 169,000,000 | 158,000,000 | $ 258,000,000
Tax Year 2010 Through Tax Year 2013 [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Tax (benefit) provision recorded |  |  |  |  |  | 152,000,000 |  |  |
Accruals no longer required [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Tax (benefit) provision recorded |  |  | $ 114,000,000 |  | $ 41,000,000 |  |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Net operating losses carry forward |  | $ 569,000,000 |  |  |  | $ 569,000,000 |  |  |
Mondelez and PMI [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized tax benefits |  |  |  | $ 0 |  |  |  | 0 |
PMI | Tax Year 2007 Through Tax Year 2009 [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Tax (benefit) provision recorded |  |  |  |  |  |  |  | $ (41,000,000) |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Income tax rate | 21.00% |  |  |  |  |  |  |  |

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