Long-Term Debt - Narrative (Details)	Jun. 30, 2020 USD ($)
Debt Instrument [Line Items]
Face amount of debt	$ 4,500,000,000
0.75% notes due 2026
Debt Instrument [Line Items]
Face amount of debt	$ 1,000,000,000.0
Stated interest rate (as percent)	0.75%
1.45% notes due 2030
Debt Instrument [Line Items]
Face amount of debt	$ 1,250,000,000
Stated interest rate (as percent)	1.45%
2.35% notes due 2040
Debt Instrument [Line Items]
Face amount of debt	$ 1,000,000,000.0
Stated interest rate (as percent)	2.35%
2.45% notes due 2050
Debt Instrument [Line Items]
Face amount of debt	$ 1,250,000,000
Stated interest rate (as percent)	2.45%

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=119993939&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

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant