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Debt - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt | $ 6,306 | $ 6,301
Less: amount due within one year | 405 | 405
Total long-term debt | $ 5,901 | 5,896
1.63% Convertible Notes, due 2019 |  |
Debt Instrument [Line Items] |  |
Long-term debt, interest rate (percentage) | 1.63% |
Long-term debt | $ 403 | 403
6.150% Notes, due 2020 |  |
Debt Instrument [Line Items] |  |
Long-term debt, interest rate (percentage) | 6.15% |
Long-term debt | $ 1,000 | 1,000
5.40% Notes due 2021 |  |
Debt Instrument [Line Items] |  |
Long-term debt, interest rate (percentage) | 5.40% |
Long-term debt | $ 1,250 | 1,250
5.87% Notes, due 2022 |  |
Debt Instrument [Line Items] |  |
Long-term debt, interest rate (percentage) | 5.87% |
Long-term debt | $ 627 | 627
5.125% Notes, due 2024 |  |
Debt Instrument [Line Items] |  |
Long-term debt, interest rate (percentage) | 5.125% |
Long-term debt | $ 1,250 | 1,250
5.90% Notes, due 2027 |  |
Debt Instrument [Line Items] |  |
Long-term debt, interest rate (percentage) | 5.90% |
Long-term debt | $ 625 | 625
6.75% Bonds, due 2028 |  |
Debt Instrument [Line Items] |  |
Long-term debt, interest rate (percentage) | 6.75% |
Long-term debt | $ 300 | 300
5.95% Notes, due 2037 |  |
Debt Instrument [Line Items] |  |
Long-term debt, interest rate (percentage) | 5.95% |
Long-term debt | $ 625 | 625
Iowa Finance Authority Loan, due 2042 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 250 | 250
Other |  |
Debt Instrument [Line Items] |  |
Other | $ (24) | $ (29)

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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