Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investment in Affiliate - Summary of Consolidated Financial Position and Results of Operations of Holding Companies, Accounted for Using Equity Method (Detail)

v2.4.1.9
Equity Method Investment in Affiliate - Summary of Consolidated Financial Position and Results of Operations of Holding Companies, Accounted for Using Equity Method (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Equity Method Investments and Joint Ventures [Abstract]    
Current Assets $ 51us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets $ 46us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
Total Assets 1,504us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets 1,580us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
Current Liabilities 17us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities 16us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
Total Liabilities 68us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities 70us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
Members' Equity 1,436us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity 1,510us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
Revenue 155us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue 142us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
Income from Continuing Operations 44us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems 16us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems
Net Income $ 44us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss $ 16us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss