XML 67 R51.htm IDEA: XBRL DOCUMENT v3.19.3
Segment Information - Schedule of Segment Reporting Information, by Segment (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]        
Interest expense $ 160 $ 147 $ 462 $ 434
Operating Segments        
Segment Reporting Information [Line Items]        
Interest income 1 2 6 7
Interest expense $ 9 $ 8 $ 29 $ 29