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Available-For-Sale Securities (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) $ in Millions | Mar. 31, 2016 USD ($)
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Rabbi Trust [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than one year | $ 9
1 - 5 years | 42
6 - 10 years | 47
11 - 15 years | 5
16 - 20 years | 9
Over 20 years | 80
Total Available-for-Sale Debt Securities | 192
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Less than one year | 24
1 - 5 years | 215
6 - 10 years | 209
11 - 15 years | 57
16 - 20 years | 53
Over 20 years | 316
Total Available-for-Sale Debt Securities | $ 874

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- Definition Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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