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Long-term Employee Benefits (Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total weighted-average allocation | 100.00% | 100.00% |
Pension Plan [Member] | Foreign [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | $ 500 | $ 1,268 | $ 1,363
Pension Plan [Member] | Foreign [Member] | Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total weighted-average allocation | 8.00% | 5.00% |
Total pension assets before pension receivables | $ 41 | $ 67 |
Pension Plan [Member] | Foreign [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets before pension receivables | 41 | 67 |
Pension Plan [Member] | Foreign [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets before pension receivables | $ 0 | $ 0 |
Pension Plan [Member] | Foreign [Member] | Equity securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total weighted-average allocation | 52.00% | 45.00% |
Total pension assets before pension receivables | $ 102 | $ 264 |
Pension Plan [Member] | Foreign [Member] | Equity securities [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets before pension receivables | 101 | 263 |
Pension Plan [Member] | Foreign [Member] | Equity securities [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets before pension receivables | $ 1 | $ 1 |
Pension Plan [Member] | Foreign [Member] | Fixed Income Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total weighted-average allocation | 40.00% | 50.00% |
Pension Plan [Member] | Foreign [Member] | Total Pension Assets Before Pension Receivables [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | $ 509 | $ 1,260 |
Pension Plan [Member] | Foreign [Member] | Total Pension Assets Before Pension Receivables [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 200 | 374 |
Pension Plan [Member] | Foreign [Member] | Total Pension Assets Before Pension Receivables [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | 309 | 886 |
Pension Plan [Member] | Foreign [Member] | Pension Trust Payables, Net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets | (9) |  |
Pension Plan [Member] | Foreign [Member] | Government Issued [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets before pension receivables | 150 | 487 |
Pension Plan [Member] | Foreign [Member] | Government Issued [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets before pension receivables | 9 | 3 |
Pension Plan [Member] | Foreign [Member] | Government Issued [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets before pension receivables | 141 | 484 |
Pension Plan [Member] | Foreign [Member] | Corporate Issued [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets before pension receivables | 51 | 130 |
Pension Plan [Member] | Foreign [Member] | Corporate Issued [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets before pension receivables | 47 | 33 |
Pension Plan [Member] | Foreign [Member] | Corporate Issued [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets before pension receivables | 4 | 97 |
Pension Plan [Member] | Foreign [Member] | Mututal Funds [Member} |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets before pension receivables | 135 | 296 |
Pension Plan [Member] | Foreign [Member] | Mututal Funds [Member} | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets before pension receivables | 0 | 0 |
Pension Plan [Member] | Foreign [Member] | Mututal Funds [Member} | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets before pension receivables | 135 | 296 |
Pension Plan [Member] | Foreign [Member] | Derivative Financial Instruments, Assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets before pension receivables | 28 | 9 |
Pension Plan [Member] | Foreign [Member] | Derivative Financial Instruments, Assets | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets before pension receivables | 0 | 0 |
Pension Plan [Member] | Foreign [Member] | Derivative Financial Instruments, Assets | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets before pension receivables | 28 | 9 |
Pension Plan [Member] | Foreign [Member] | Derivative Financial Instruments, Liabilities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension liability before pension receivables | 0 | (5) |
Pension Plan [Member] | Foreign [Member] | Derivative Financial Instruments, Liabilities | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension liability before pension receivables | 0 | 0 |
Pension Plan [Member] | Foreign [Member] | Derivative Financial Instruments, Liabilities | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension liability before pension receivables | 0 | (5) |
Pension Plan [Member] | Foreign [Member] | Other Plan Assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets before pension receivables | 2 | 12 |
Pension Plan [Member] | Foreign [Member] | Other Plan Assets | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets before pension receivables | 2 | 8 |
Pension Plan [Member] | Foreign [Member] | Other Plan Assets | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets before pension receivables | $ 0 | 4 |
Pension Plan [Member] | Foreign [Member] | Pension Trust Receivables, Net [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension assets |  | $ 8 |

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