Business Segments - Segment Operating Results (Parenthetical) (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Product Liability Contingency [Line Items] | |||
| Net provisions for litigations and regulatory proceedings | $ 3,420 | $ 1,240 | $ 844 |
| Income tax benefit from tax legislation | 487 | ||
| Americas [Member] | |||
| Product Liability Contingency [Line Items] | |||
| Income tax benefit from tax legislation | $ 487 | ||