Guarantor (Narrative) (Details) - Oct. 26, 2015 £ in Billions, $ in Billions	GBP (£)	USD ($)
Debt Instrument [Line Items]
Outstanding notes being tendered for exchange and settled		$ 36.0
0.964% six months notes due in 2016
Debt Instrument [Line Items]
Outstanding notes being tendered for exchange and settled		$ 15.3
Debt conversion, converted instrument, rate	0.964%	0.964%
Debt Conversion Converted Instrument Expiration Or Due Month and Year	Apr. 30, 2016	Apr. 30, 2016
1.363% six months notes due in 2016
Debt Instrument [Line Items]
Outstanding notes being tendered for exchange and settled \| £	£ 0.8
Debt conversion, converted instrument, rate	1.363%	1.363%
Debt Conversion Converted Instrument Expiration Or Due Month and Year	Apr. 30, 2016	Apr. 30, 2016
2.342% notes due in 2020
Debt Instrument [Line Items]
Outstanding notes being tendered for exchange and settled		$ 6.1
Debt conversion, converted instrument, rate	2.342%	2.342%
Debt Conversion Converted Instrument Expiration Or Due Date Year	2020	2020
3.373% notes due in 2025
Debt Instrument [Line Items]
Outstanding notes being tendered for exchange and settled		$ 2.0
Debt conversion, converted instrument, rate	3.373%	3.373%
Debt Conversion Converted Instrument Expiration Or Due Date Year	2025	2025
4.418% notes due in 2035
Debt Instrument [Line Items]
Outstanding notes being tendered for exchange and settled		$ 11.5
Debt conversion, converted instrument, rate	4.418%	4.418%
Debt Conversion Converted Instrument Expiration Or Due Date Year	2035	2035

The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

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- Definition

Expiration, mandatory redemption, or due date, in CCYY-MM-DD format, of the financial instrument issued in exchange for the original debt being converted in a noncash or part noncash transaction.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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Year of expiration or mandatory redemption of the financial instrument issued in exchange for the original debt being converted in a noncash or part noncash transaction, in CCYY format.

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- Definition

Dividend or interest rate associated with the financial instrument issued in exchange for the original debt being converted in a noncash or part noncash transaction. Noncash are transactions that affect recognized assets or liabilities but that do not result in cash receipts or cash payments. Part noncash refers to that portion of the transaction not resulting in cash receipts or cash payments.

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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.

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