XML 98 R80.htm IDEA: XBRL DOCUMENT v3.20.4
Debt and Borrowing Arrangements - Fair Value of Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt $ 21,568 $ 19,388
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt $ 20,046 $ 18,426