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Financial Instruments - Schedule of Consolidated Long-Term Debt (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of detailed information about financial instruments [line items] |  |
Long term borrowings | $ 9,160 | $ 9,303
Bank loans [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Long term borrowings | 2,649 |
Notes payable [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Long term borrowings | 6,511 |
Later Than One Year and Not Later Than Two Years [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Long term borrowings | 186 |
Later Than One Year and Not Later Than Two Years [Member] | Bank loans [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Long term borrowings | 180 |
Later Than One Year and Not Later Than Two Years [Member] | Notes payable [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Long term borrowings | 6 |
Later Than Two Years and Not Later Than Three Years [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Long term borrowings | 772 |
Later Than Two Years and Not Later Than Three Years [Member] | Bank loans [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Long term borrowings | 766 |
Later Than Two Years and Not Later Than Three Years [Member] | Notes payable [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Long term borrowings | 6 |
Later Than Three Years and Not Later Than Four Years [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Long term borrowings | 1,399 |
Later Than Three Years and Not Later Than Four Years [Member] | Bank loans [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Long term borrowings | 603 |
Later Than Three Years and Not Later Than Four Years [Member] | Notes payable [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Long term borrowings | 796 |
Later Than Four Years and Not Later Than Five Years [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Long term borrowings | 2,326 |
Later Than Four Years and Not Later Than Five Years [Member] | Bank loans [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Long term borrowings | 1,100 |
Later Than Four Years and Not Later Than Five Years [Member] | Notes payable [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Long term borrowings | 1,226 |
More than 5 Years [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Long term borrowings | 4,477 |
More than 5 Years [Member] | Notes payable [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Long term borrowings | $ 4,477 |

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