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Debt - Schedule of Long-Term Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt	$ 8,048	$ 8,789
Less: amount due within one year	4	3
Long-term debt, excluding amount due within one year	8,044	8,786
Long-term debt	8,048	8,789
5.55% Notes, Due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt		750
Long-term debt		750
6.50% Bonds, Due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	250	250
Long-term debt	250	250
6.75% Notes, Due 2018 [Member]
Debt Instrument [Line Items]
Long-term debt	750	750
Long-term debt	750	750
5.72% Notes, Due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt	750	750
Long-term debt	750	750
1.63% Convertible Notes, Due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt	403	403
Long-term debt	403	403
6.150% Notes, Due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	1,000	1,000
Long-term debt	1,000	1,000
5.40% Notes, Due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	1,250	1,250
Long-term debt	1,250	1,250
5.87% Notes, Due 2022 [Member]
Debt Instrument [Line Items]
Long-term debt	627	627
Long-term debt	627	627
5.125% Notes, Due 2024 [Member]
Debt Instrument [Line Items]
Long-term debt	1,250	1,250
Long-term debt	1,250	1,250
5.90% Notes, Due 2027 [Member]
Debt Instrument [Line Items]
Long-term debt	625	625
Long-term debt	625	625
6.75% Bonds, Due 2028 [Member]
Debt Instrument [Line Items]
Long-term debt	300	300
Long-term debt	300	300
5.95% Notes Due 2037 [Member]
Debt Instrument [Line Items]
Long-term debt	625	625
Long-term debt	625	625
Iowa Finance Authority Loan, Due 2042 (4.75%) [Member]
Debt Instrument [Line Items]
Long-term debt	250	250
Long-term debt	250	250
Other [Member]
Debt Instrument [Line Items]
Long-term debt	32	41
Long-term debt	$ 32	$ 41

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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/presentationRef
-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=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
-Topic 942
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-Name Accounting Standards Codification
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