Significant Accounting Policies	3 Months Ended
Significant Accounting Policies	Mar. 31, 2020
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies The information presented on Marketable Debt Securities, Accounts and Notes Receivable and GM Financial Receivables supplements the Significant Accounting Policies information presented in our 2019 Form 10-K to reflect the adoption of ASU 2016-13 that became effective January 1, 2020. See our 2019 Form 10-K for a description of our significant accounting policies in effect prior to the adoption of ASU 2016-13. Marketable Debt Securities We classify marketable debt securities as either available-for-sale or trading. Various factors, including turnover of holdings and investment guidelines, are considered in determining the classification of securities. Available- for-sale debt securities are recorded at fair value with unrealized gains, and losses that are not credit related, recorded net of applicable taxes in Accumulated other comprehensive loss until realized. Credit losses are recorded in Interest income and other non-operating income, net. An evaluation is made quarterly to determine if any portion of unrealized losses on available-for-sale debt securities is related to credit losses or whether any unrealized losses recorded in Accumulated other comprehensive loss need to be reclassified. Non-credit related unrealized losses are reclassified to Interest income and other non-operating income, net if we intend to sell the security or it is more likely than not that we will be required to sell the security before the recovery of the unrealized loss. Accounts and Notes Receivable Accounts and notes receivable primarily consists of amounts that are due and payable from our customers for the sale of vehicles, parts, and accessories. We evaluate the collectability of receivables each reporting period and record an allowance for doubtful accounts to present the net amount expected to be collected on our receivables. Additions to the allowance are charged to bad debt expense and reported in Automotive and other selling, general and administrative expense. GM Financial Receivables Finance receivables are carried at amortized cost, net of allowance for loan losses. Provisions for loan losses are charged to operations in amounts sufficient to maintain the allowance for loan losses at levels considered adequate to cover expected credit losses on the finance receivables. For retail finance receivables, GM Financial uses static pool modeling techniques to determine the allowance for loan losses expected over the remaining life of the receivables, which is supplemented by management judgment. The modeling techniques incorporate reasonable and supportable forecasts of economic conditions over the expected remaining life of the finance receivables. The economic forecasts incorporate factors which vary by region that GM Financial believes will have the largest impact on expected losses, including unemployment rates, interest rate spreads, disposable personal income and growth rates in gross domestic product. Troubled debt restructurings (TDRs) are grouped separately for purposes of measuring the allowance. The allowance for TDRs uses static pool modeling techniques like non-TDR retail finance receivables to determine the expected loss amount. The expected cash flows of the receivables are then discounted at the original weighted average effective interest rate of the pool. Factors considered when estimating the allowance for TDRs are based on an evaluation of historical and current information, which may be supplemented by management judgment. Finance charge income from loans classified as TDRs is accounted for in the same manner as other accruing loans. Cash collections on these loans are allocated according to the same payment hierarchy methodology applied to loans that are not classified as TDRs. Commercial finance receivables are carried at amortized cost, net of allowance for loan losses and any amounts received under a cash management program. GM Financial establishes the allowance for loan losses based on historical loss experience, as well as the forecast for industry vehicle sales, which is the economic indicator believed to have the largest impact on expected losses.