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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.