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Debt (Tables)
 12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Long-Term Debt
Long-Term Debt.
December 31,
2018
 
2017
5.72% Notes, due 2019
$
—

 
$
500

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(1)
(29
)
 
(23
)
 
6,301

 
6,807

Less: amount due within one year
405

 
1

 
$
5,896

 
$
6,806

(1) 
Includes various financing arrangements related to subsidiaries, unamortized debt discounts related to outstanding notes and bonds listed in the table above, an equity option related to the convertible notes due in 2019, and unamortized debt issuance costs.