XML 127 R110.htm IDEA: XBRL DOCUMENT v3.22.4
Segment and Related Information - Geographical (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]      
Operating revenues $ 19,698 $ 17,931 $ 15,218
Property and equipment, net 15,719 14,419 14,148
US      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Operating revenues 18,860 17,136 14,505
Property and equipment, net 14,725 13,428 13,168
Canada [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Operating revenues 838 795 713
Property and equipment, net $ 994 $ 991 $ 980