Retirement Benefits Plans Retirement Benefits Plans - Fair Value of Other Postretirement Benefits Plan Assets (Details 12) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value of Other Postretirement Benefits Plan Assets [Line Items]
Global equities	$ 70	$ 75
Fixed income securities	29	29
United States treasuries	38	38
Cash equivalents	1	4
Total other postretirement benefits plan assets	138	146
Quoted prices in active markets for identical assets (Level 1) [Member]
Fair Value of Other Postretirement Benefits Plan Assets [Line Items]
Global equities	0	0
Fixed income securities	0	0
United States treasuries	38	38
Cash equivalents	1	4
Total other postretirement benefits plan assets	39	42
Other observable inputs (Level 2) [Member]
Fair Value of Other Postretirement Benefits Plan Assets [Line Items]
Global equities	70	75
Fixed income securities	29	29
United States treasuries	0	0
Cash equivalents	0	0
Total other postretirement benefits plan assets	99	104
Unobservable inputs (Level 3) [Member]
Fair Value of Other Postretirement Benefits Plan Assets [Line Items]
Global equities	0	0
Fixed income securities	0	0
United States treasuries	0	0
Cash equivalents	0	0
Total other postretirement benefits plan assets	$ 0	$ 0