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Employee Benefit Plans (Assets Carried at Fair Value) (Details) (USD $)
In Millions
Jun. 30, 2011
Jun. 30, 2010
Cash equivalents $ 3 $ 1
Mutual funds 238 196
Common/Collective trusts 169 138
Total assets at fair value 410 335
Growth And/Or Value Equity Index Funds [Member]
   
Mutual funds 152 120
Common/Collective trusts 107 83
Growth And/Or Value Equity Index Funds [Member] | Level 1 [Member]
   
Mutual funds 152 120
Growth And/Or Value Equity Index Funds [Member] | Level 2 [Member]
   
Common/Collective trusts 107 83
Bond Fund [Member]
   
Mutual funds 48 44
Common/Collective trusts 62 55
Bond Fund [Member] | Level 1 [Member]
   
Mutual funds 48 44
Bond Fund [Member] | Level 2 [Member]
   
Common/Collective trusts 62 55
Emerging Market Fund [Member]
   
Mutual funds 19 15
Emerging Market Fund [Member] | Level 1 [Member]
   
Mutual funds 19 15
Real Estate Fund [Member]
   
Mutual funds 19 17
Real Estate Fund [Member] | Level 1 [Member]
   
Mutual funds 19 17
Level 1 [Member]
   
Cash equivalents 3 1
Mutual funds 238 196
Total assets at fair value 241 197
Level 2 [Member]
   
Common/Collective trusts 169 138
Total assets at fair value $ 169 $ 138