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Debt Obligation - Schedule Required Annual Principal Payments of Long-term Debt, Excluding Debt Issuance Cost (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Long Term Debt Maturity [Line Items]  
2020 $ 2,596
2021 4,205
2022 2,017
2023 4,473
2024 and thereafter 13,513
Total $ 26,804