Long-Term Debt (Details) - Unsecured Debt [Member] - USD ($) $ in Millions		3 Months Ended
Apr. 20, 2016	Apr. 29, 2016
April 2016 Debt Issuance [Member]
Long-Term Debt
Unsecured notes, issued	$ 3,300
Debt instrument, redemption price, percentage	101.00%
2019 Floating Rate Notes [Member]
Long-Term Debt
Unsecured notes, issued	$ 250
Unsecured notes, maturity date	Apr. 30, 2019
Unsecured notes, interest rate		0.87%
Unamortized discount	$ 1
Unsecured notes, description of variable rate basis		three-month LIBOR
Unsecured notes, basis spread on variable rate	0.24%
2019 Fixed Rate Notes [Member]
Long-Term Debt
Unsecured notes, issued	$ 350
Unsecured notes, maturity date	Apr. 30, 2019
Unsecured notes, interest rate	1.15%
Unamortized discount	$ 1
2026 Fixed Rate Notes [Member]
Long-Term Debt
Unsecured notes, issued	$ 1,350
Unsecured notes, maturity date	Apr. 30, 2026
Unsecured notes, interest rate	2.50%
Unamortized discount	$ 12
2046 Fixed Rate Notes [Member]
Long-Term Debt
Unsecured notes, issued	$ 1,350
Unsecured notes, maturity date	Apr. 30, 2046
Unsecured notes, interest rate	3.70%
Unamortized discount	$ 19

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

+ Details

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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/presentationRef
-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

+ Details

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

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- Definition

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

+ Details

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Balance Type:	debit
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- References

No definition available.

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- Details

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- Details

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