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Summary of Significant Accounting Policies - Additional Information (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 12, 2021 businessAcquired | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2020 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Consideration transferred in acquisition |  | $ 100,000,000 |  |  |
Delinquent period in which recognition of income on loans is suspended |  | 90 days |  |  |
Minimum period of delinquency reported on receivables past due date |  | 30 days |  |  |
Advertising expense |  | $ 121,000,000 | $ 167,000,000 | $ 170,000,000 |
Foreign currency transaction loss |  | 11,000,000 | 155,000,000 | 450,000,000 |
Net loss realized on foreign currency |  | 57,000,000 | 80,000,000 | 199,000,000 |
CNH paid interest |  | 667,000,000 | 762,000,000 | 807,000,000 |
Loss on repurchase of Notes |  | 0 | 27,000,000 | 22,000,000 |
CNH paid taxes |  | 159,000,000 | 208,000,000 | 355,000,000 |
Gain (loss) at the time of securitization |  | 0 |  |  |
Impairment of goodwill and other intangible assets |  | 0 | 0 |  |
Investments in unconsolidated subsidiaries and affiliates |  | 529,000,000 | 631,000,000 |  |
Deferred tax assets |  | 1,451,000,000 | 1,134,000,000 |  |
Decrease in retained earnings |  | (3,279,000,000) | (3,808,000,000) |  |
Other non-cash items |  | 570,000,000 | 209,000,000 | 158,000,000 |
Tangible and intangible asset writedowns |  | 259,000,000 |  |  |
Writedowns of buyback commitments |  | 162,000,000 |  |  |
Writedowns of financial assets |  | 152,000,000 |  |  |
Investments at fair value through profit and loss |  | 392,000,000 | 0 |  |
Nikola Corporation |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Gain on remeasurement |  | $ 134,000,000 |  |  |
Subsequent Event |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Number of businesses acquired | businessAcquired | 4 |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Allowance for credit loss |  |  |  |  | $ 26,000,000
Investments in unconsolidated subsidiaries and affiliates |  |  |  |  | 17,000,000
Deferred tax assets |  |  |  |  | 7,000,000
Decrease in retained earnings |  |  |  |  | $ 36,000,000
Minimum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Intangible asset useful life |  | 5 years |  |  |
Maximum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Intangible asset useful life |  | 25 years |  |  |
Case New Holland Industrial Inc. (formerly Case New Holland Inc.) | 7.875% Notes |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Loss on repurchase of Notes |  | $ 0 | 27,000,000 | 22,000,000 |
Argentina |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Foreign currency transaction loss |  | $ 56,000,000 | $ 71,000,000 | $ 159,000,000 |

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