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EBP Plan Assets (Details 4) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Equities - International small cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Equities - Emerging markets value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Equities - Emerging markets growth [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Equities - International developed markets large cap value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Fixed income - Corporate bonds [Member]
Commingled investment funds - fixed income [Member]
Dec. 31, 2013
Pension Benefits [Member]
Dec. 31, 2012
Pension Benefits [Member]
Dec. 31, 2011
Pension Benefits [Member]
Dec. 31, 2013
Pension Benefits [Member]
Equity securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Fixed income securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Fixed income securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
U.S. equity securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
International equity securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Cash management fund [Member]
Dec. 31, 2012
Pension Benefits [Member]
Cash management fund [Member]
Dec. 31, 2013
Pension Benefits [Member]
U.S. large cap [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
U.S. large cap [Member]
Equity securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
U.S. small cap [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
U.S. small cap [Member]
Equity securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
International developed markets large cap growth [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
International developed markets large cap growth [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Emerging markets growth [Member]
Equity securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Preferred stock [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Preferred stock [Member]
Equity securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Equities - U.S. large cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Equities - U.S. large cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Equities - International small cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Equities - Emerging markets value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Equities - Emerging markets value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Equities - Emerging markets growth [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Equities - International developed markets large cap value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Equities - International developed markets large cap value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Fixed income - Corporate bonds [Member]
Commingled investment funds - fixed income [Member]
Dec. 31, 2012
Pension Benefits [Member]
Fixed income - Corporate bonds [Member]
Commingled investment funds - fixed income [Member]
Dec. 31, 2013
Pension Benefits [Member]
U.S. Treasury securities [Member]
Fixed income securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
U.S. Treasury securities [Member]
Fixed income securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Mortgage-backed securities [Member]
Fixed income securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Mortgage-backed securities [Member]
Fixed income securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Corporate bonds [Member]
Fixed income securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Corporate bonds [Member]
Fixed income securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Insurance company investment contracts and other [Member]
Dec. 31, 2012
Pension Benefits [Member]
Insurance company investment contracts and other [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 1 [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 1 [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 1 [Member]
Cash management fund [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 1 [Member]
Cash management fund [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 1 [Member]
U.S. large cap [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 1 [Member]
U.S. large cap [Member]
Equity securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 1 [Member]
U.S. small cap [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 1 [Member]
U.S. small cap [Member]
Equity securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 1 [Member]
International developed markets large cap growth [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 1 [Member]
International developed markets large cap growth [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 1 [Member]
Emerging markets growth [Member]
Equity securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 1 [Member]
Preferred stock [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 1 [Member]
Preferred stock [Member]
Equity securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 1 [Member]
Equities - U.S. large cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 1 [Member]
Equities - U.S. large cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 1 [Member]
Equities - International small cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 1 [Member]
Equities - Emerging markets value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 1 [Member]
Equities - Emerging markets value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 1 [Member]
Equities - Emerging markets growth [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 1 [Member]
Equities - International developed markets large cap value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 1 [Member]
Equities - International developed markets large cap value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 1 [Member]
Fixed income - Corporate bonds [Member]
Commingled investment funds - fixed income [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 1 [Member]
Fixed income - Corporate bonds [Member]
Commingled investment funds - fixed income [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 1 [Member]
U.S. Treasury securities [Member]
Fixed income securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 1 [Member]
U.S. Treasury securities [Member]
Fixed income securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 1 [Member]
Mortgage-backed securities [Member]
Fixed income securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 1 [Member]
Mortgage-backed securities [Member]
Fixed income securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 1 [Member]
Corporate bonds [Member]
Fixed income securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 1 [Member]
Corporate bonds [Member]
Fixed income securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 1 [Member]
Insurance company investment contracts and other [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 1 [Member]
Insurance company investment contracts and other [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 2 [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 2 [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 2 [Member]
Cash management fund [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 2 [Member]
Cash management fund [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 2 [Member]
U.S. large cap [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 2 [Member]
U.S. large cap [Member]
Equity securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 2 [Member]
U.S. small cap [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 2 [Member]
U.S. small cap [Member]
Equity securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 2 [Member]
International developed markets large cap growth [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 2 [Member]
International developed markets large cap growth [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 2 [Member]
Emerging markets growth [Member]
Equity securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 2 [Member]
Preferred stock [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 2 [Member]
Preferred stock [Member]
Equity securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 2 [Member]
Equities - U.S. large cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 2 [Member]
Equities - U.S. large cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 2 [Member]
Equities - International small cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 2 [Member]
Equities - Emerging markets value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 2 [Member]
Equities - Emerging markets value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 2 [Member]
Equities - Emerging markets growth [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 2 [Member]
Equities - International developed markets large cap value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 2 [Member]
Equities - International developed markets large cap value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 2 [Member]
Fixed income - Corporate bonds [Member]
Commingled investment funds - fixed income [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 2 [Member]
Fixed income - Corporate bonds [Member]
Commingled investment funds - fixed income [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 2 [Member]
U.S. Treasury securities [Member]
Fixed income securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 2 [Member]
U.S. Treasury securities [Member]
Fixed income securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 2 [Member]
Mortgage-backed securities [Member]
Fixed income securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 2 [Member]
Mortgage-backed securities [Member]
Fixed income securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 2 [Member]
Corporate bonds [Member]
Fixed income securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 2 [Member]
Corporate bonds [Member]
Fixed income securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 2 [Member]
Insurance company investment contracts and other [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 2 [Member]
Insurance company investment contracts and other [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 3 [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 3 [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 3 [Member]
Cash management fund [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 3 [Member]
Cash management fund [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 3 [Member]
U.S. large cap [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 3 [Member]
U.S. large cap [Member]
Equity securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 3 [Member]
U.S. small cap [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 3 [Member]
U.S. small cap [Member]
Equity securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 3 [Member]
International developed markets large cap growth [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 3 [Member]
International developed markets large cap growth [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 3 [Member]
Emerging markets growth [Member]
Equity securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 3 [Member]
Preferred stock [Member]
Equity securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 3 [Member]
Preferred stock [Member]
Equity securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 3 [Member]
Equities - U.S. large cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 3 [Member]
Equities - U.S. large cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 3 [Member]
Equities - International small cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 3 [Member]
Equities - Emerging markets value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 3 [Member]
Equities - Emerging markets value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 3 [Member]
Equities - Emerging markets growth [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 3 [Member]
Equities - International developed markets large cap value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 3 [Member]
Equities - International developed markets large cap value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 3 [Member]
Fixed income - Corporate bonds [Member]
Commingled investment funds - fixed income [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 3 [Member]
Fixed income - Corporate bonds [Member]
Commingled investment funds - fixed income [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 3 [Member]
U.S. Treasury securities [Member]
Fixed income securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 3 [Member]
U.S. Treasury securities [Member]
Fixed income securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 3 [Member]
Mortgage-backed securities [Member]
Fixed income securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 3 [Member]
Mortgage-backed securities [Member]
Fixed income securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 3 [Member]
Corporate bonds [Member]
Fixed income securities [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 3 [Member]
Corporate bonds [Member]
Fixed income securities [Member]
Dec. 31, 2013
Pension Benefits [Member]
Level 3 [Member]
Insurance company investment contracts and other [Member]
Dec. 31, 2012
Pension Benefits [Member]
Level 3 [Member]
Insurance company investment contracts and other [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Dec. 31, 2011
Other Postretirement Benefits [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Fixed income securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Fixed income securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Cash management fund [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Cash management fund [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
U.S. large cap [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
U.S. large cap [Member]
Equity securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
U.S. small cap [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
U.S. small cap [Member]
Equity securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
International developed markets large cap growth [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
International developed markets large cap growth [Member]
Equity securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Emerging markets growth [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Emerging markets growth [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Preferred stock [Member]
Equity securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Equities - U.S. large cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Equities - U.S. large cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Equities - International small cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Equities - Emerging markets value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Equities - Emerging markets value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Equities - Emerging markets growth [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Equities - International developed markets large cap value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Equities - International developed markets large cap value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Fixed income - Corporate bonds [Member]
Commingled investment funds - fixed income [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Fixed income - Corporate bonds [Member]
Commingled investment funds - fixed income [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
U.S. Treasury securities [Member]
Fixed income securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
U.S. Treasury securities [Member]
Fixed income securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Government and municipal bonds [Member]
Fixed income securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Government and municipal bonds [Member]
Fixed income securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Mortgage-backed securities [Member]
Fixed income securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Mortgage-backed securities [Member]
Fixed income securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Corporate bonds [Member]
Fixed income securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Corporate bonds [Member]
Fixed income securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 1 [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 1 [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 1 [Member]
Cash management fund [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 1 [Member]
Cash management fund [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 1 [Member]
U.S. large cap [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 1 [Member]
U.S. large cap [Member]
Equity securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 1 [Member]
U.S. small cap [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 1 [Member]
U.S. small cap [Member]
Equity securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 1 [Member]
International developed markets large cap growth [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 1 [Member]
International developed markets large cap growth [Member]
Equity securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 1 [Member]
Emerging markets growth [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 1 [Member]
Emerging markets growth [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 1 [Member]
Preferred stock [Member]
Equity securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 1 [Member]
Equities - U.S. large cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 1 [Member]
Equities - U.S. large cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 1 [Member]
Equities - International small cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 1 [Member]
Equities - Emerging markets value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 1 [Member]
Equities - Emerging markets value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 1 [Member]
Equities - Emerging markets growth [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 1 [Member]
Equities - International developed markets large cap value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 1 [Member]
Equities - International developed markets large cap value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 1 [Member]
Fixed income - Corporate bonds [Member]
Commingled investment funds - fixed income [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 1 [Member]
Fixed income - Corporate bonds [Member]
Commingled investment funds - fixed income [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 1 [Member]
U.S. Treasury securities [Member]
Fixed income securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 1 [Member]
U.S. Treasury securities [Member]
Fixed income securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 1 [Member]
Government and municipal bonds [Member]
Fixed income securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 1 [Member]
Government and municipal bonds [Member]
Fixed income securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 1 [Member]
Mortgage-backed securities [Member]
Fixed income securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 1 [Member]
Mortgage-backed securities [Member]
Fixed income securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 1 [Member]
Corporate bonds [Member]
Fixed income securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 1 [Member]
Corporate bonds [Member]
Fixed income securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 2 [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 2 [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 2 [Member]
Cash management fund [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 2 [Member]
Cash management fund [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 2 [Member]
U.S. large cap [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 2 [Member]
U.S. large cap [Member]
Equity securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 2 [Member]
U.S. small cap [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 2 [Member]
U.S. small cap [Member]
Equity securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 2 [Member]
International developed markets large cap growth [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 2 [Member]
International developed markets large cap growth [Member]
Equity securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 2 [Member]
Emerging markets growth [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 2 [Member]
Emerging markets growth [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 2 [Member]
Preferred stock [Member]
Equity securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 2 [Member]
Equities - U.S. large cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 2 [Member]
Equities - U.S. large cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 2 [Member]
Equities - International small cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 2 [Member]
Equities - Emerging markets value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 2 [Member]
Equities - Emerging markets value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 2 [Member]
Equities - Emerging markets growth [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 2 [Member]
Equities - International developed markets large cap value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 2 [Member]
Equities - International developed markets large cap value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 2 [Member]
Fixed income - Corporate bonds [Member]
Commingled investment funds - fixed income [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 2 [Member]
Fixed income - Corporate bonds [Member]
Commingled investment funds - fixed income [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 2 [Member]
U.S. Treasury securities [Member]
Fixed income securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 2 [Member]
U.S. Treasury securities [Member]
Fixed income securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 2 [Member]
Government and municipal bonds [Member]
Fixed income securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 2 [Member]
Government and municipal bonds [Member]
Fixed income securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 2 [Member]
Mortgage-backed securities [Member]
Fixed income securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 2 [Member]
Mortgage-backed securities [Member]
Fixed income securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 2 [Member]
Corporate bonds [Member]
Fixed income securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 2 [Member]
Corporate bonds [Member]
Fixed income securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 3 [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 3 [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 3 [Member]
Cash management fund [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 3 [Member]
Cash management fund [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 3 [Member]
U.S. large cap [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 3 [Member]
U.S. large cap [Member]
Equity securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 3 [Member]
U.S. small cap [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 3 [Member]
U.S. small cap [Member]
Equity securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 3 [Member]
International developed markets large cap growth [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 3 [Member]
International developed markets large cap growth [Member]
Equity securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 3 [Member]
Emerging markets growth [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 3 [Member]
Emerging markets growth [Member]
Equity securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 3 [Member]
Preferred stock [Member]
Equity securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 3 [Member]
Equities - U.S. large cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 3 [Member]
Equities - U.S. large cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 3 [Member]
Equities - International small cap [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 3 [Member]
Equities - Emerging markets value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 3 [Member]
Equities - Emerging markets value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 3 [Member]
Equities - Emerging markets growth [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 3 [Member]
Equities - International developed markets large cap value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 3 [Member]
Equities - International developed markets large cap value [Member]
Commingled investment funds - equities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 3 [Member]
Fixed income - Corporate bonds [Member]
Commingled investment funds - fixed income [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 3 [Member]
Fixed income - Corporate bonds [Member]
Commingled investment funds - fixed income [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 3 [Member]
U.S. Treasury securities [Member]
Fixed income securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 3 [Member]
U.S. Treasury securities [Member]
Fixed income securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 3 [Member]
Government and municipal bonds [Member]
Fixed income securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 3 [Member]
Government and municipal bonds [Member]
Fixed income securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 3 [Member]
Mortgage-backed securities [Member]
Fixed income securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 3 [Member]
Mortgage-backed securities [Member]
Fixed income securities [Member]
Dec. 31, 2013
Other Postretirement Benefits [Member]
Level 3 [Member]
Corporate bonds [Member]
Fixed income securities [Member]
Dec. 31, 2012
Other Postretirement Benefits [Member]
Level 3 [Member]
Corporate bonds [Member]
Fixed income securities [Member]
Defined Benefit Plan Disclosure [Line Items]                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
Proportion of assets subjected to income tax                                                                                                                                                                                                                                                                                 40.00%                                                                                                                                                                                                                                                            
Plan assets target allocation range, minimum                   54.00% 36.00%   37.00% 17.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
Plan assets target allocation range, maximum                   66.00% 44.00%   45.00% 21.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
Maximum percentage of total stock portfolio invested in the common stock of any one corporation 5.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
Maximum percentage of portfolio invested in fixed income securities of any one issuer with exception of bond index funds and U. S. government guaranteed and agency securities 5.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
Number of active investment managers managing plan funds             10                                                                                                                                                                                                                                                                   4                                                                                                                                                                                                                                                            
Number of passive investment managers managing plan funds             1                                                                                                                                                                                                                                                                   1                                                                                                                                                                                                                                                            
Each investment manager responsibility to manage the plans' funds, minimum 1.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
Each investment manager responsibility to manage the plans' funds, maximum 15.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Maximum Percentage In Emerging Markets   15.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Maximum Time Span To Require Redemption Fee   180 days                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Fee   1.50%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
Length of notice period for redemption of commingled investment funds   10 days 10 days 15 days 10 days                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
Maximum allocation to BBB rated securities           10.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
Target approximate duration in years           20 years                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
Weighted average duration of fixed income security portfolio1                     6 years 6 years                                                                                                                                                                                                                                                               5 years 5 years                                                                                                                                                                                                                                                    
Fair values of plan assets                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
Total assets at fair value             $ 1,241 $ 1,071 $ 965           $ 23 $ 21 $ 211 $ 169 $ 146 $ 115 $ 59 $ 62 $ 21 $ 2 $ 6 $ 179 $ 146 $ 24 $ 34 $ 33 $ 19 $ 100 $ 83 $ 140 $ 150 $ 30 $ 22 $ 67 $ 68 $ 200 $ 171 $ 7 $ 4 $ 412 $ 337 $ 23 $ 21 $ 211 $ 169 $ 146 $ 115 $ 0 $ 1 $ 3 $ 2 $ 6 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 30 $ 22 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 829 $ 734 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 59 $ 61 $ 18 $ 0 $ 0 $ 179 $ 146 $ 24 $ 34 $ 33 $ 19 $ 100 $ 83 $ 140 $ 150 $ 0 $ 0 $ 67 $ 68 $ 200 $ 171 $ 7 $ 4 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 201 $ 175 $ 159     $ 13 $ 14 $ 52 $ 42 $ 29 $ 21 $ 15 $ 13 $ 2 $ 5 $ 1 $ 18 $ 15 $ 2 $ 4 $ 3 $ 2 $ 10 $ 9 $ 14 $ 15 $ 3 $ 2 $ 10 $ 10 $ 7 $ 7 $ 20 $ 18 $ 98 $ 81 $ 13 $ 14 $ 52 $ 42 $ 29 $ 21 $ 0 $ 0 $ 1 $ 1 $ 1 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 3 $ 2 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 103 $ 94 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 15 $ 13 $ 1 $ 4 $ 0 $ 18 $ 15 $ 2 $ 4 $ 3 $ 2 $ 10 $ 9 $ 14 $ 15 $ 0 $ 0 $ 10 $ 10 $ 7 $ 7 $ 20 $ 18 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0