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Long-term Employee Benefits (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2015 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Decrease to net pension assets | $ 158 |  |  |  |
Settlement loss | 380 |  | $ 381 | $ (18) | $ (22)
Employer contributions during period |  |  | 34 | $ 51 | $ 45
Netherlands Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Pension benefits | $ 932 |  | $ 932 |  |
Minimum [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer matching contribution percent of employees' gross pay |  | 1.00% |  |  |
Maximum [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer matching contribution percent of employees' gross pay |  | 7.00% |  |  |
Parent Issuer [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Employer matching contribution percent of match |  | 100.00% |  |  |
Employer matching contribution percent of employees' gross pay |  | 6.00% |  |  |
Employer contribution vesting period |  | 3 years |  |  |

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- Definition For a classified balance sheet, the carrying amount as of the balance sheet date of the portion of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement that is payable after one year (or beyond the operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -SubTopic 10 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6410138&loc=d3e79691-111665 + Details
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