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v3.4.0.3

NDT Funds (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] |  |  |  |
Amortized cost - maturity less than 1 year |  | $ 5 |  |
Amortized cost - maturity between 1 and 5 years |  | 106 |  |
Amortized cost - maturity between 6 and 10 years |  | 68 |  |
Amortized cost - maturity in excess of 10 years |  | 54 |  |
Amortized cost total |  | 233 |  |
Fair value - maturity less than 1 year |  | 5 |  |
Fair value - maturity between 1 and 5 years |  | 109 |  |
Fair value - maturity between 6 and 10 years |  | 71 |  |
Fair value - maturity in excess of 10 years |  | 60 |  |
Fair value total |  | 245 |  |
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] |  |  |  |
Proceeds from sales of NDT securities |  | 54 | $ 38 |
Gross realized gains | [1] | 6 | 5 |
Gross realized losses | [1] | 8 | $ 3 |
NDT Funds |  |  |  |
Available-for-sale Securities, Balance Sheet, Reported Amounts [Abstract] |  |  |  |
Amortized cost |  | 543 |  | $ 538
Gross unrealized gains |  | 421 |  | 413
Gross unrealized losses |  | 0 |  | 0
Fair value |  | 964 |  | 951
NDT Funds | Cash and cash equivalents |  |  |  |
Available-for-sale Securities, Balance Sheet, Reported Amounts [Abstract] |  |  |  |
Amortized cost |  | 7 |  | 11
Gross unrealized gains |  | 0 |  | 0
Gross unrealized losses |  | 0 |  | 0
Fair value |  | 7 |  | 11
NDT Funds | Equity securities |  |  |  |
Available-for-sale Securities, Balance Sheet, Reported Amounts [Abstract] |  |  |  |
Amortized cost |  | 301 |  | 297
Gross unrealized gains |  | 409 |  | 406
Gross unrealized losses |  | 0 |  | 0
Fair value |  | 710 |  | 703
NDT Funds | Debt securities |  |  |  |
Available-for-sale Securities, Balance Sheet, Reported Amounts [Abstract] |  |  |  |
Amortized cost |  | 233 |  | 230
Gross unrealized gains |  | 12 |  | 7
Gross unrealized losses |  | 0 |  | 0
Fair value |  | 245 |  | 237
NDT Funds | Receivables/payables, net |  |  |  |
Available-for-sale Securities, Balance Sheet, Reported Amounts [Abstract] |  |  |  |
Amortized cost |  | 2 |  | 0
Gross unrealized gains |  | 0 |  | 0
Gross unrealized losses |  | 0 |  | 0
Fair value |  | $ 2 |  | $ 0
[1] | Excludes the impact of other-than-temporary impairment charges recognized on the Statements of Income.

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