Short-term Borrowings and Long-term Debt Short-term Borrowings and Long-term Debt (Narrative) (Details) (USD $) In Millions, unless otherwise specified		0 Months Ended
Aug. 06, 2012	Aug. 02, 2012 Floating Rate Notes due August 1, 2014 [Member]	Aug. 02, 2012 Two Point Five Percent Notes due August 2, 2022 [Member]	Aug. 02, 2012 Three Point Eight Percent Notes due August 2, 2042 [Member]	Aug. 02, 2012 Commercial Paper [Member]	Aug. 06, 2012 Purchase Price Allocation Adjustments [Member]
Business Acquisition, Cost of Acquired Entity, Purchase Price	$ 1,550					$ 20
Debt Instrument, Face Amount		$ 400	$ 450	$ 400	$ 326
Debt Instrument, Interest Rate Terms		LIBOR plus 0.3%
Debt Instrument, Interest Rate, Stated Percentage			2.50%	3.80%

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

Reference 1: 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=6451184&loc=d3e28551-108399

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=6584090&loc=d3e28878-108400

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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