Employee Benefit Plans - Summary of Amounts Recognized in Accumulated Comprehensive Loss (Income) for Material Defined Benefit Plans (Detail) - Material defined benefit plans [Member] - USD ($)
$ in Millions |
12 Months Ended |
Dec. 31, 2021 |
Dec. 31, 2020 |
| Disclosure Of Net Defined Benefit Liability Asset [Line Items] |
|
|
| Balance of accumulated comprehensive loss (income) at January 1 |
$ 1,309
|
$ 1,386
|
| Net actuarial (gains) losses recognized in the year |
(227)
|
(77)
|
| Total accumulated comprehensive loss (income) at December 31, |
1,082
|
1,309
|
| Funded Plans [Member] |
|
|
| Disclosure Of Net Defined Benefit Liability Asset [Line Items] |
|
|
| Balance of accumulated comprehensive loss (income) at January 1 |
1,312
|
1,391
|
| Net actuarial (gains) losses recognized in the year |
(224)
|
(79)
|
| Total accumulated comprehensive loss (income) at December 31, |
1,088
|
1,312
|
| Unfunded Plans [Member] |
|
|
| Disclosure Of Net Defined Benefit Liability Asset [Line Items] |
|
|
| Balance of accumulated comprehensive loss (income) at January 1 |
103
|
82
|
| Net actuarial (gains) losses recognized in the year |
(5)
|
21
|
| Total accumulated comprehensive loss (income) at December 31, |
98
|
103
|
| Other Post Employment Benefits [Member] |
|
|
| Disclosure Of Net Defined Benefit Liability Asset [Line Items] |
|
|
| Balance of accumulated comprehensive loss (income) at January 1 |
(106)
|
(87)
|
| Net actuarial (gains) losses recognized in the year |
2
|
(19)
|
| Total accumulated comprehensive loss (income) at December 31, |
$ (104)
|
$ (106)
|