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Fair Value of Debt (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt [1] $ 1,712 $ 2,110
Short-term debt [1] 363 302
Long-term debt, fair value 1,821 2,237
Short-term debt, fair value 366 305
Bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt [1] 1,359 1,377
Long-term debt, fair value 1,453 1,483
Other Long-term Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt [1] 1 1
Long-term debt, fair value 1 1
Loans    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt [1] 352 732
Long-term debt, fair value 367 753
Overdrafts and Other Short-Term Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt [1] 10 27
Short-term debt, fair value 10 27
Short-Term Portion of Long-Term Debt    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term debt [1] 353 275
Short-term debt, fair value $ 356 $ 278
[1] Debt as reported in balance sheet.