v3.3.1.900

Retirement Benefits Plans Retirement Benefits Plans - Fair Value of Other Postretirement Benefits Plan Assets (Details 12) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Fair Value of Other Postretirement Benefits Plan Assets [Line Items] |  |
Global equities | $ 44 | $ 54
Fixed income securities | 18 | 24
United States treasuries | 20 | 37
Cash equivalents | 11 | 1
Total other postretirement benefits plan assets | $ 93 | 116
VEBA target trust allocation in diversified global equities | 50.00% |
VEBA target trust allocation in fixed income securities | 50.00% |
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 | 20 | 37
Cash equivalents | 11 | 1
Total other postretirement benefits plan assets | 31 | 38
Other observable inputs (Level 2) [Member] |  |
Fair Value of Other Postretirement Benefits Plan Assets [Line Items] |  |
Global equities | 44 | 54
Fixed income securities | 18 | 24
United States treasuries | 0 | 0
Cash equivalents | 0 | 0
Total other postretirement benefits plan assets | 62 | 78
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

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