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Accumulated Other Comprehensive Loss - Tax Impact (Detail)
$ in Millions
1 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Outstanding derivatives $ 0 $ 0
Treasury rate lock [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Cash received on derivative $ 1  
Derivative Instruments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss) before reclassifications, tax   0
Amounts reclassified from accumulated other comprehensive (income) loss, tax   1
Available for sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss) before reclassifications, tax   2
Amounts reclassified from accumulated other comprehensive (income) loss, tax   0
Foreign Currency Translation Adjustments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss) before reclassifications, tax   0
Amounts reclassified from accumulated other comprehensive (income) loss, tax   0
Post - Retirement Benefit Obligation [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss) before reclassifications, tax   0
Amounts reclassified from accumulated other comprehensive (income) loss, tax   $ 0