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Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Schedule of Long-Term Debt | Long-Term Debt.
December 31, | 2017 | 2016
6.50% Bonds, due 2018 | $ | — |  | $ | 250 |
6.75% Notes, due 2018 | — |  | 750 |
5.72% Notes, due 2019 | 500 |  | 750 |
1.63% Convertible Notes, due 2019* | 403 |  | 403 |
6.150% Notes, due 2020 | 1,000 |  | 1,000 |
5.40% Notes, due 2021 | 1,250 |  | 1,250 |
5.87% Notes, due 2022 | 627 |  | 627 |
5.125% Notes, due 2024 | 1,250 |  | 1,250 |
5.90% Notes, due 2027 | 625 |  | 625 |
6.75% Bonds, due 2028 | 300 |  | 300 |
5.95% Notes due 2037 | 625 |  | 625 |
Iowa Finance Authority Loan, due 2042 (4.75%) | 250 |  | 250 |
Other** | (23 | ) | (32 | )
| 6,807 |  | 8,048 |
Less: amount due within one year | 1 |  | 4 |
| $ | 6,806 |  | $ | 8,044 |
* | Amount was assumed in conjunction with the acquisition of RTI (see Note F).
** | Other includes various financing arrangements related to subsidiaries, unamortized debt discounts related to the outstanding notes and bonds listed in the table above, an equity option related to the convertible notes due in 2019 (see Note F), adjustments to the carrying value of long-term debt related to an interest swap contract accounted for as a fair value hedge that was unwound during 2017, and unamortized debt issuance costs.

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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