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Long-Term Debt (Schedule of Aggregate Maturities of Long-Term Debt Obligations) (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument    
Contractually obligated payments for long-term debt due in 2020 $ 2,172  
Contractually obligated payments for long-term debt due in 2021 3,173  
Contractually obligated payments for long-term debt due in 2022 2,098  
Contractually obligated payments for long-term debt due in 2023 514  
Contractually obligated payments for long-term debt due in 2024 2,339  
Thereafter 4,674  
Total 14,970 $ 14,426
Parent Company    
Debt Instrument    
Contractually obligated payments for long-term debt due in 2020 1,099  
Contractually obligated payments for long-term debt due in 2021 250  
Contractually obligated payments for long-term debt due in 2022 1,198  
Contractually obligated payments for long-term debt due in 2023 0  
Contractually obligated payments for long-term debt due in 2024 2,241  
Thereafter 2,725  
Total 7,513  
Subsidiaries    
Debt Instrument    
Contractually obligated payments for long-term debt due in 2020 1,073  
Contractually obligated payments for long-term debt due in 2021 2,923  
Contractually obligated payments for long-term debt due in 2022 900  
Contractually obligated payments for long-term debt due in 2023 514  
Contractually obligated payments for long-term debt due in 2024 98  
Thereafter 1,949  
Total $ 7,457