Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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)(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13)(2))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

Bank Financing and Debt Additional Disclosures (Details) - USD ($)	Mar. 31, 2016	Jan. 31, 2016	Dec. 31, 2015
Debt Instruments [Line Items]
Commercial paper	$ 0		$ 0
Senior Notes [Member]
Debt Instruments [Line Items]
Face value of senior debt	$ 8,240,000,000		$ 8,440,000,000
Senior Notes [Member] \| Maximum [Member]
Debt Instruments [Line Items]
Stated interest rate	7.875%
Senior Notes [Member] \| Minimum [Member]
Debt Instruments [Line Items]
Stated interest rate	1.95%
Senior Notes [Member] \| Senior Debentures 2016 [Member]
Debt Instruments [Line Items]
Stated interest rate		7.625%
Face value of senior debt		$ 200,000,000