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Short-Term Borrowings, Long-Term Debt and Available Credit Facilities Long-term debt (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Mar. 22, 2019 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 1,530 |  |  |
Finance lease obligations |  | $ 6 |  | $ 67 |  | $ 9
Unamortized Debt Discount and Issuance Costs |  | 0 |  | 2 |  | 3
Long-term Debt Due within one year |  | 4 |  | 263 |  | 508
Long-term Debt |  | 116 |  | 5,784 | [1] | 10,215
Loans Payable [Member] | Promissory Notes and Debentures, Final Maturity 2019 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross | [2] | $ 0 |  | $ 263 |  | $ 508
Long-term Debt, Weighted Average Interest Rate | [2] | 0.00% |  | 2.23% |  | 2.23%
Loans Payable [Member] | Promissory Notes and Debentures, Final Maturity 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross | [2] | $ 0 |  | $ 2,496 |  | $ 3,046
Long-term Debt, Weighted Average Interest Rate | [2] | 0.00% |  | 2.14% |  | 2.03%
Loans Payable [Member] | Promissory Notes and Debentures, Final Maturity 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross | [2] | $ 0 |  | $ 475 |  | $ 1,562
Long-term Debt, Weighted Average Interest Rate | [2] | 0.00% |  | 2.08% |  | 2.07%
Loans Payable [Member] | Promissory Notes and Debentures, Final Maturity 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross | [2] | $ 0 |  | $ 386 |  | $ 1,267
Long-term Debt, Weighted Average Interest Rate | [2] | 0.00% |  | 2.48% |  | 2.48%
Loans Payable [Member] | Promissory Notes and Debentures, Final Maturity 2024 and Thereafter |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross | [2] | $ 0 |  | $ 249 |  | $ 2,211
Long-term Debt, Weighted Average Interest Rate | [2] | 0.00% |  | 3.69% |  | 3.80%
Loans Payable [Member] | Term Loan Facility due 2020 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross | [3] | $ 0 |  | $ 2,000 |  | $ 2,000
Long-term Debt, Weighted Average Interest Rate | [3] | 0.00% |  | 3.46% |  | 3.12%
Loans Payable [Member] | Foreign Currency Loans [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  | $ 4 |  | $ 3 |  | $ 13
Medium-term Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  | $ 110 |  | $ 110 |  | $ 110
Long-term Debt, Weighted Average Interest Rate |  | 1.88% |  | 2.37% |  | 2.04%
[1] | Includes adjustments for discontinued operations and common control business combination.
[2] | See discussion of debt redemptions/repayments that follows.
[3] | The Term Loan Facility was amended in 2018 to extend the maturity date to June 2020 and, subsequently, the facility was repaid and terminated in May 2019.

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