Debt Obligations - Schedule of Short-term Debt (Detail) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Current maturities of long-term liabilities	$ 757	$ 2,880
Total short term debt	$ 1,272	3,646
Term loan JPY 28.3 billion [Member]
Debt Instrument [Line Items]
Maturity	2018
Short-term borrowings		251
Term loan JPY 28.3 billion [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Japan, Yen
Debt Instrument [Line Items]
Description of Variable Rate Basis	JPY LIBOR+0.25%
Basis Spread on Variable Rate	0.25%
Convertible debentures [Member]
Debt Instrument [Line Items]
Weighted average interest rate	0.25%
Maturity	2026
Short-term borrowings	$ 514	514
Short Term Debt Other [Member]
Debt Instrument [Line Items]
Weighted average interest rate	11.58%
Maturity	2018
Short-term borrowings	$ 1	$ 1

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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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.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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