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Debt (Unsecured Fixed Rate Debt Securities Issued Under Current Shelf Registration) (Details) - USD ($)		3 Months Ended
	Apr. 07, 2020	Mar. 31, 2020	Jan. 31, 2020
Unsecured Debt [Member] | 2.150% Notes Due 2027 [Member]
Debt Instrument [Line Items]
Issuance date		Jan. 31, 2020
Note amount			$ 500,000,000
Interest rate			2.15%
Maturity date		Feb. 05, 2027
Unsecured Debt [Member] | 2.400% Notes Due 2030 [Member]
Debt Instrument [Line Items]
Issuance date		Jan. 31, 2020
Note amount			$ 750,000,000
Interest rate			2.40%
Maturity date		Feb. 05, 2030
Unsecured Debt [Member] | 3.250% Notes Due 2050 [Member]
Debt Instrument [Line Items]
Issuance date		Jan. 31, 2020
Note amount			$ 1,000,000,000.0
Interest rate			3.25%
Maturity date		Feb. 05, 2050
Unsecured Debt [Member] | 3.750% Notes Due 2070 [Member]
Debt Instrument [Line Items]
Issuance date		Jan. 31, 2020
Note amount			$ 750,000,000
Interest rate			3.75%
Maturity date		Feb. 05, 2070
Subsequent Event [Member] | 3.250% Notes Due 2050 [Member]
Debt Instrument [Line Items]
Issuance date	Apr. 07, 2020
Note amount	$ 750,000,000
Interest rate	3.25%
Maturity date	Feb. 05, 2050

X

- Definition

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

+ References

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

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-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

Date the debt instrument was issued, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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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.

+ References

No definition available.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
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