XML 131 R115.htm IDEA: XBRL DOCUMENT v3.20.4
Financial Instruments - Estimated Fair Values of Instruments Not Carried at Fair Value in Balance Sheets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivables $ 18,457 $ 19,428
Debt 26,053 24,854
Fair Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing receivables 18,726 19,375
Debt $ 26,630 $ 25,249