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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

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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.

+ References

No definition available.

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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
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- Definition

Gross amount of debt extinguished.

+ References

No definition available.

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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.

+ References

No definition available.

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Period Type:	instant

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ 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(19)(a))
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Debt (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
Debt (Narrative) (Details) - USD ($)	Sep. 30, 2016	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Short-term borrowings	$ 0		$ 0		$ 0
Reported Value Measurement [Member]
Debt Instrument [Line Items]
Long-term debt	13,900,000,000		13,900,000,000		12,800,000,000
Fair Value, Inputs, Level 2 [Member] \| Estimate of Fair Value Measurement [Member]
Debt Instrument [Line Items]
Long-term debt	16,100,000,000		16,100,000,000		$ 14,500,000,000
Senior Notes [Member]
Debt Instrument [Line Items]
Notes purchased	933,000,000	$ 793,000,000	$ 933,000,000	$ 793,000,000
Senior Notes [Member]
Debt Instrument [Line Items]
Percentage of aggregate principal to be repaid			101.00%
Senior Notes [Member] \| Senior Unsecured Long Term Notes Due 2026 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	$ 500,000,000.0		$ 500,000,000.0
Interest rate	2.625%		2.625%
Senior Notes [Member] \| Senior Unsecured Long Term Notes Due 2046 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	$ 1,500,000,000.0		$ 1,500,000,000.0
Interest rate	3.875%		3.875%
Senior Notes [Member] \| Notes Issued, 2008 and 2009 [Member] \| Subject to Credit Rating Step Up [Member]
Debt Instrument [Line Items]
Aggregate principal amount	$ 2,500,000,000.0		$ 2,500,000,000.0