Long-term Debt - Summary of Long-term Debt (Details) $ in Millions	Jun. 30, 2019 EUR (€)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Principal amount at par		$ 12,696
Senior Notes
Debt Instrument [Line Items]
Principal amount at par \| €	€ 3,600,000,000
Senior Notes \| 5.375% Senior Notes
Debt Instrument [Line Items]
Principal amount at par		500
Fair value		$ 519	$ 509
Interest rate	5.375%	5.375%
Senior Notes \| 5.50% Senior Notes
Debt Instrument [Line Items]
Principal amount at par		$ 700
Fair value		$ 738	706
Interest rate	5.50%	5.50%
Senior Notes \| 5.750% Senior Notes
Debt Instrument [Line Items]
Principal amount at par		$ 400
Fair value		$ 435	407
Interest rate	5.75%	5.75%
Senior Notes \| 5.875% Senior Notes
Debt Instrument [Line Items]
Principal amount at par		$ 800
Fair value		$ 883	812
Interest rate	5.875%	5.875%
Senior Notes \| 4.375% Senior Notes
Debt Instrument [Line Items]
Principal amount at par		$ 1,000
Fair value		$ 1,025	915
Interest rate	4.375%	4.375%
Senior Notes \| 3.625% Senior Notes
Debt Instrument [Line Items]
Principal amount at par	€ 1,300,000,000	$ 1,479
Fair value		$ 1,620	1,446
Interest rate	3.625%	3.625%
Senior Notes \| 4.875% Senior Notes
Debt Instrument [Line Items]
Principal amount at par		$ 1,600
Fair value		$ 1,656	1,464
Interest rate	4.875%	4.875%
Senior Notes \| 5.875% Senior Notes
Debt Instrument [Line Items]
Principal amount at par		$ 1,900
Fair value		$ 2,109	1,851
Interest rate	5.875%	5.875%
Senior Notes \| 4.625% Senior Notes
Debt Instrument [Line Items]
Principal amount at par	€ 1,100,000,000	$ 1,252
Fair value		$ 1,424	1,241
Interest rate	4.625%	4.625%
Senior Notes \| 6.375% Senior Notes
Debt Instrument [Line Items]
Principal amount at par		$ 800
Fair value		$ 910	797
Interest rate	6.375%	6.375%
Senior Notes \| 3.875% Senior Notes
Debt Instrument [Line Items]
Principal amount at par	€ 1,200,000,000	$ 1,365
Fair value		$ 1,482	0
Interest rate	3.875%	3.875%
Senior Notes \| 5.375% Senior Notes
Debt Instrument [Line Items]
Principal amount at par		$ 900
Fair value		$ 959	$ 0
Interest rate	5.375%	5.375%

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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.

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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