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Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt | $ 5,909 | $ 6,301
Less: amount due within one year | 1,003 | 405
Long-term Debt, Excluding Current Maturities | 4,906 | 5,896
1.63% Convertible Notes, due 2019 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 0 | 403
6.150% Notes, due 2020 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 1,000 | 1,000
5.40% Notes, due 2021 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 1,250 | 1,250
5.87% Notes, due 2022 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 627 | 627
5.125% Notes, due 2024 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 1,250 | 1,250
5.90% Notes, due 2027 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 625 | 625
6.75% Bonds, due 2028 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 300 | 300
5.95% Notes due 2037 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 625 | 625
Iowa Finance Authority Loan, due 2042 (4.75%) |  |
Debt Instrument [Line Items] |  |
Long-term debt | 250 | 250
Other |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 18 | $ 29

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