|
Derivative instruments Derivative Instruments (Details) (Cash flow hedge [Member], Cross currency swap contracts [Member])
In Millions, unless otherwise specified |
Mar. 31, 2013
2.125% euro denominated notes due 2019 (2.125% 2019 euro Notes) [Member]
USD ($)
|
Mar. 31, 2013
2.125% euro denominated notes due 2019 (2.125% 2019 euro Notes) [Member]
EUR (€)
|
Mar. 31, 2013
5.50% pound sterling denominated notes due 2026 (5.50% 2026 pound sterling Notes) [Member]
USD ($)
|
Mar. 31, 2013
5.50% pound sterling denominated notes due 2026 (5.50% 2026 pound sterling Notes) [Member]
GBP (£)
|
Mar. 31, 2013
4.00% pound sterling denominated notes due 2029 (4.00% 2029 pound sterling Notes) [Member]
USD ($)
|
Mar. 31, 2013
4.00% pound sterling denominated notes due 2029 (4.00% 2029 pound sterling Notes) [Member]
GBP (£)
|
Mar. 31, 2013
Interest rate received [Member]
2.125% euro denominated notes due 2019 (2.125% 2019 euro Notes) [Member]
|
Mar. 31, 2013
Interest rate received [Member]
5.50% pound sterling denominated notes due 2026 (5.50% 2026 pound sterling Notes) [Member]
|
Mar. 31, 2013
Interest rate received [Member]
4.00% pound sterling denominated notes due 2029 (4.00% 2029 pound sterling Notes) [Member]
|
Mar. 31, 2013
Interest rate paid [Member]
2.125% euro denominated notes due 2019 (2.125% 2019 euro Notes) [Member]
|
Mar. 31, 2013
Interest rate paid [Member]
5.50% pound sterling denominated notes due 2026 (5.50% 2026 pound sterling Notes) [Member]
|
Mar. 31, 2013
Interest rate paid [Member]
4.00% pound sterling denominated notes due 2029 (4.00% 2029 pound sterling Notes) [Member]
|
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Derivative [Line Items] | ||||||||||||
| Notional Amount | $ 864 | € 675 | $ 748 | £ 475 | $ 1,122 | £ 700 | ||||||
| Fixed Interest Rate | 2.125% | 5.50% | 4.00% | 2.60% | 5.80% | 4.30% |