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Debt (Unsecured Fixed Rate Debt Securities Issued Under Current Shelf Registration) (Details) - Unsecured Debt [Member] - USD ($)	6 Months Ended
	Jun. 30, 2020	Apr. 07, 2020	Jan. 31, 2020
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
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
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
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
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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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- Definition

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

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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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
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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))
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-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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