v3.10.0.1

Debt - Summary of Outstanding Long-Term Debt (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt instrument principal amount	$ 7,400,000,000	$ 6,650,000,000
Debt instrument interest rate effective percentage	0.00%	0.00%
Liabilities arising from capital lease transactions	$ 27,000,000	$ 29,000,000
Unamortized discounts, premiums and debt issuance costs	(31,000,000)	(28,000,000)
Fair value of embedded cash conversion option	(42,000,000)	(86,000,000)
Total debt, including unamortized discounts, premiums, debt issuance costs [and fair value adjustments]	7,354,000,000	6,565,000,000
Long-term debt
Total debt, including unamortized discounts, premiums, debt issuance costs [and fair value adjustments]	7,354,000,000	6,565,000,000
Current portion of long-term debt	(1,107,000,000)	(751,000,000)
Long-term debt	$ 6,247,000,000	5,814,000,000
Fixed-Rate 3.75% Senior Unsecured Notes Maturing in June 2018 [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	2018-06
Debt instrument principal amount	$ 0	$ 750,000,000
Debt instrument interest rate effective percentage	3.75%	3.75%
Fixed-Rate 4.125% Senior Unsecured Notes Maturing in June 2020 [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	2020-06
Debt instrument principal amount	$ 600,000,000	$ 600,000,000
Debt instrument interest rate effective percentage	4.125%	4.125%
Fixed-Rate 4.125% Senior Unsecured Notes Maturing in June 2021 [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	2021-06
Debt instrument principal amount	$ 1,350,000,000	$ 1,350,000,000
Debt instrument interest rate effective percentage	4.125%	4.125%
Fixed-Rate 4.625% Senior Unsecured Notes Maturing in June 2022 [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	2022-06
Debt instrument principal amount	$ 400,000,000	$ 400,000,000
Debt instrument interest rate effective percentage	4.625%	4.625%
Fixed-Rate 3.875% Senior Unsecured Notes Maturing in September 2022 [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	2022-09
Debt instrument principal amount	$ 1,000,000,000	$ 1,000,000,000
Debt instrument interest rate effective percentage	3.875%	3.875%
Fixed-Rate 5.75% Senior Unsecured Notes Maturing in March 2023 [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	2023-03
Debt instrument principal amount	$ 0	$ 500,000,000
Debt instrument interest rate effective percentage	5.75%	5.75%
Fixed-Rate 4.625% Senior Unsecured Notes Maturing in June 2023 [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	2023-06
Debt instrument principal amount	$ 900,000,000	$ 900,000,000
Debt instrument interest rate effective percentage	4.625%	4.625%
Fixed-Rate 4.875% Senior Unsecured Notes Maturing in March 2024 [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	2024-03
Debt instrument principal amount	$ 1,000,000,000	$ 0
Debt instrument interest rate effective percentage	4.875%	0.00%
Fixed-Rate 5.35% Senior Unsecured Notes Maturing in March 2026 [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	2026-03
Debt instrument principal amount	$ 500,000,000	$ 0
Debt instrument interest rate effective percentage	5.35%	0.00%
Fixed-Rate 5.55% Senior Unsecured Notes Maturing in December 2028 [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	2028-12
Debt instrument principal amount	$ 500,000,000	$ 0
Debt instrument interest rate effective percentage	5.55%	0.00%
Fixed-Rate 1% Cash Convertible Notes Maturing in December 2019 [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	2019-12
Debt instrument principal amount	$ 1,150,000,000	$ 1,150,000,000
Debt instrument interest rate effective percentage	1.00%	1.00%
Floating-Rate Revolving Credit Facility Maturing in December 2020 [Member]
Debt Instrument [Line Items]
Debt instrument maturity date	2020-12
Debt instrument principal amount	$ 0	$ 0
Debt instrument interest rate effective percentage	0.00%	0.00%

X

- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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

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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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This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of long-term debt instruments that have contractual principal amounts and for which the fair value option has been elected.

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