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Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Receivables |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss | $ 100 |  |  |  | $ 110 |  |  |  | $ 100 | $ 110 |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense |  |  |  |  |  |  |  |  | 47 | $ 23 | $ 26 |
Inventory Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of LIFO Inventory |  |  |  |  | 10.00% |  |  |  |  | 10.00% |  |
Cost of products sold |  |  |  |  |  |  |  |  | (59,902) | $ (60,509) | (60,160) |
Net Income (Loss) Attributable to Parent | $ 687 | $ 225 | $ 469 | $ 391 | $ 504 | $ 407 | $ 235 | $ 233 | $ 1,772 | $ 1,379 | $ 1,810 |
Diluted earnings per common share (dollars per share) | $ 1.22 | $ 0.40 | $ 0.84 | $ 0.69 | $ 0.90 | $ 0.72 | $ 0.42 | $ 0.41 | $ 3.15 | $ 2.44 | $ 3.19 |
Inventory, LIFO Reserve, Period Charge |  |  |  |  |  |  |  |  | $ 147 |  |  |
Inventory, LIFO Reserve, Period Charge, After-tax |  |  |  |  |  |  |  |  | $ 113 |  |  |
Inventory, LIFO Reserve, Period Charge, Per Share |  |  |  |  |  |  |  |  | $ 0.20 |  |  |
Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  |  |
Capitalized interest on major construction projects |  |  |  |  |  |  |  |  | $ 14 | $ 15 | $ 21 |
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment |  |  |  |  |  |  |  |  | 26 | 11 | 9 |
Asset Abandonments and Write-Downs |  |  |  |  |  |  |  |  |  |  |  |
Asset Abandonments and Impairments |  |  |  |  |  |  |  |  | 28 | 131 | 100 |
Research and Development |  |  |  |  |  |  |  |  |  |  |  |
Research and development expenses, net of expenditures subsequently reimbursed by government grants |  |  |  |  |  |  |  |  | 160 | 154 | 141 |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ (20,022) |  |  |  | $ (19,225) |  |  |  | (20,022) | (19,225) | (18,996) | $ (18,322)
Change in Accounting Principle, Other [Member] |  |  |  |  |  |  |  |  |  |  |  |
Inventory Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Cost of products sold |  |  |  | $ 91 |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  |  |  | $ 69 |  |  |  |  |  |  |  |
Diluted earnings per common share (dollars per share) |  |  |  | $ 0.12 |  |  |  |  |  |  |  |
Reinvested Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ (19,780) |  |  |  |  |  |  |  | $ (19,780) |  | $ (18,527) | $ (17,552)
Accounting Standards Update 2019-05 |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  | 8 |  |  |  |  | 8 |  |
Accounting Standards Update 2019-05 | Reinvested Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements and Changes in Accounting Principles [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  | $ 8 |  |  |  |  | $ 8 |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  | 1 year |  |  |
Minimum [Member] | Building [Member] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 15 years |  |  |
Minimum [Member] | Machinery And Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 3 years |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  | 50 years |  |  |
Maximum [Member] | Building [Member] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 40 years |  |  |
Maximum [Member] | Machinery And Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant, and Equipment |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 40 years |  |  |

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