XML 60 R46.htm IDEA: XBRL DOCUMENT v3.24.2.u1
Fair Value Measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Cash $ 225 $ 208
Cash and Cash Equivalents    
Cash equivalents:    
Cost Basis 1,819 2,032
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 1,819 2,032
U.S. and Canadian government obligations | Cash and Cash Equivalents    
Cash equivalents:    
Cost Basis 1,146 1,488
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 1,146 1,488
Other debt securities | Cash and Cash Equivalents    
Cash equivalents:    
Cost Basis 448 336
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 448 336
Nonqualified employee benefit trusts    
Cash equivalents:    
Cost Basis 15 16
Unrealized Gains 2 1
Unrealized Losses 0 0
Fair Value $ 17 $ 17