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Summary of Contractual Maturities of Financial Liabilities and Other Contractual Commitments (Parenthetical) (Detail) - 6.5% Senior Notes Due 2021 [Member]
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Disclosure of Nonderivative Financial Instruments [Line Items]  
Long term debt interest rate 6.50%
Long term debt maturity year December 15, 2021
Amount redeemed $ 75
Liquidity risk [Member]  
Disclosure of Nonderivative Financial Instruments [Line Items]  
Long term debt interest rate 6.50%
Long term debt maturity year 15-Dec-21
Amount redeemed $ 25