Accounts receivable as of September 30, 2013 and December 31, 2012 consisted of:

• Includes $6.4 billion and $7.5 billion of gross Card Member receivables available to settle obligations of consolidated VIEs as of September 30, 2013 and December 31, 2012, respectively.
• Includes $476 million of gross Card Member receivables available to settle obligations of a consolidated VIE as of December 31, 2012. Also includes $857 million and $913 million due from airlines, of which Delta Air Lines (Delta) comprises $600 million and $676 million as of September 30, 2013 and December 31, 2012, respectively.
• Includes receivables primarily related to the Company's International Currency Card portfolios.
• Includes approximately $13.7 billion of Card Member receivables outside the United States for both September 30, 2013 and December 31, 2012.
• Other receivables primarily represent amounts related to (i) purchased joint venture receivables, (ii) certain merchants for billed discount revenue, and (iii) Global Network Services (GNS) partner banks for items such as royalty and franchise fees. Other receivables are presented net of reserves for losses of $77 million and $86 million as of September 30, 2013 and December 31, 2012, respectively.

The following table represents the aging of Card Member loans and receivables as of September 30, 2013 and December 31, 2012:

• For Card Member receivables in International Card Services (ICS) and Global Commercial Services (GCS), delinquency data is tracked based on days past billing status rather than days past due. A Card Member account is considered 90 days past billing if payment has not been received within 90 days of the Card Member's billing statement date. In addition, if the Company initiates collection procedures on an account prior to the account becoming 90 days past billing the associated Card Member receivable balance is considered as 90 days past billing. These amounts are shown above as 90+ Days Past Due for presentation purposes.
• Data for periods prior to 90 days past billing are not available due to financial reporting system constraints. Therefore, it has not been relied upon for risk management purposes. The balances that are current to 89 days past due can be derived as the difference between the Total and the 90+ Days Past Due balances.

The following table provides additional information with respect to the Company's impaired Card Member loans, which are not significant for GCS, and Card Member receivables, which are not significant for ICS and GCS, as of September 30, 2013 and December 31, 2012:

• The Company's policy is generally to accrue interest through the date of write-off (at 180 days past due). The Company establishes reserves for interest that the Company believes will not be collected. Excludes loans modified as a TDR.
• Non-accrual loans not in modification programs include certain Card Member loans placed with outside collection agencies for which the Company has ceased accruing interest. Effective September 1, 2013 the Company began accruing interest on accounts placed with outside agencies.
• Total loans and receivables modified as a TDR includes $93 million and $320 million that are non-accrual and $20 million and $6 million that are past due 90 days and still accruing interest as of September 30, 2013 and December 31, 2012, respectively.
• Unpaid principal balance consists of Card Member charges billed and excludes other amounts charged directly by the Company such as interest and fees.
• Represents the reserve for losses for TDRs, which are evaluated individually for impairment. The Company records a reserve for losses for all impaired loans. Refer to Card Member Loans Evaluated Individually and Collectively for Impairment in Note 4 for further discussion of the reserve for losses on loans over 90 days past due and accruing interest and non-accrual loans, which are evaluated collectively for impairment.

The following table provides additional information with respect to the Card Member loans and receivables modified as TDRs, which are not significant for ICS and GCS, during the three and nine months ended September 30:

• Includes principal and accrued interest.
• The difference between the pre- and post-modification outstanding balances is attributable to amounts charged off for Card Member loans and receivables being resolved through the Company's short-term settlement programs.