Chapter 11 Proceedings - Summary of Liabilities Subject to Compromise (Parenthetical) (Detail)	Jan. 22, 2021	Dec. 31, 2020
3.45% Senior Notes due 2023 [Member]
Liabilities Subject To Compromise [Line Items]
Interest rate of senior notes	3.45%	3.45%
7.875% Senior Notes due 2025 [Member]
Liabilities Subject To Compromise [Line Items]
Interest rate of senior notes	7.875%	7.875%
5.70% Senior Notes due 2039 [Member]
Liabilities Subject To Compromise [Line Items]
Interest rate of senior notes	5.70%	5.70%
4.875% Senior Notes due 2043 [Member]
Liabilities Subject To Compromise [Line Items]
Interest rate of senior notes	4.875%	4.875%