Debt Issuance and Notes Tender Offer - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Debt Instrument [Line Items]
Net proceeds from senior notes issued	$ 1,480
Repayments of debt				$ 825	$ 51
Loss on debt extinguishment		$ 80	$ 0	80	$ 0
4.30 % Senior Notes Due April 2027
Debt Instrument [Line Items]
Senior notes issued	$ 1,000	$ 1,000		$ 1,000
Debt instrument maturity year	2027-04	2027-04		2027-04
Debt instrument coupon rate	4.30%	4.30%		4.30%
5.80 % Senior Notes Due April 2047
Debt Instrument [Line Items]
Senior notes issued	$ 500	$ 500		$ 500
Debt instrument maturity year	2047-04	2047-04		2047-04
Debt instrument coupon rate	5.80%	5.80%		5.80%
8.125% Notes Due 2019
Debt Instrument [Line Items]
Debt instrument coupon rate	8.125%	8.125%		8.125%
Repayments of debt	$ 750	$ 750		$ 750
Notes repurchase principal amount	$ 650	650		650
Loss on debt extinguishment		$ 80		$ 80
Debt instrument maturity year	2019	2019		2019
Debt instrument carrying value	$ 670	$ 670		$ 670

Amount, before unamortized (discount) premium and debt issuance costs, for extinguished long-term debt.

No definition available.

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- Definition

Debt instrument maturity period.

+ References

No definition available.

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- Definition

Debt instrument maturity year.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

+ References

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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