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Schedule I - Dividends Paid (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dividends Payable [Line Items]      
Cash dividend paid to parent company $ 2,566 $ 1,014 $ 444
Paid in December 2017 [Member]      
Dividends Payable [Line Items]      
Cash dividend paid to parent company 22    
Paid in November 2017 [Member]      
Dividends Payable [Line Items]      
Cash dividend paid to parent company 362    
Paid in September 2017 [Member]      
Dividends Payable [Line Items]      
Cash dividend paid to parent company 373    
Paid in August 2017 [Member]      
Dividends Payable [Line Items]      
Cash dividend paid to parent company 168    
Paid in May 2017 [Member]      
Dividends Payable [Line Items]      
Cash dividend paid to parent company 356    
Paid in March 2017 [Member]      
Dividends Payable [Line Items]      
Cash dividend paid to parent company 1,237    
Paid in February 2017 [Member]      
Dividends Payable [Line Items]      
Cash dividend paid to parent company 45    
Paid in January 2017 [Member]      
Dividends Payable [Line Items]      
Cash dividend paid to parent company $ 3    
Paid in December 2016 [Member]      
Dividends Payable [Line Items]      
Cash dividend paid to parent company   503  
Paid in November 2016 [Member]      
Dividends Payable [Line Items]      
Cash dividend paid to parent company   422  
Paid in June 2016 [Member]      
Dividends Payable [Line Items]      
Cash dividend paid to parent company   $ 89  
Paid in December 2015 [Member]      
Dividends Payable [Line Items]      
Cash dividend paid to parent company     1
Paid in November 2015 [Member]      
Dividends Payable [Line Items]      
Cash dividend paid to parent company     223
Paid in May 2015 [Member]      
Dividends Payable [Line Items]      
Cash dividend paid to parent company     $ 220