Financial Instruments (Details 3) (USD $) In Millions	Jun. 30, 2011
Australian Dollars [Member]
Summarization for foreign currency forward purchase and sale contracts
Notional Amount in Foreign Currency, Purchase	$ 2
British Pounds [Member]
Summarization for foreign currency forward purchase and sale contracts
Notional Amount in Foreign Currency, Purchase	4
European Euro [Member]
Summarization for foreign currency forward purchase and sale contracts
Notional Amount in Foreign Currency, Sell	(12)
Japanese Yen [Member]
Summarization for foreign currency forward purchase and sale contracts
Notional Amount in Foreign Currency, Purchase	532
South African Rand [Member]
Summarization for foreign currency forward purchase and sale contracts
Notional Amount in Foreign Currency, Purchase	164
U.S. Dollars [Member]
Summarization for foreign currency forward purchase and sale contracts
Notional Amount in Foreign Currency, Purchase	14
Notional Amount in Foreign Currency, Sell	(22)
Other Currency [Member]
Summarization for foreign currency forward purchase and sale contracts
Notional Amount in Foreign Currency, Purchase	1
Notional Amount in Foreign Currency, Sell	$ (13)