DEVON ENERGY CORPORATION AND SUBSIDIARIES NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued) Proved Undeveloped Reserves The following table presents the changes in our total proved undeveloped reserves during 2011 (in MMBoe).
## Table 0 ##
At December 31, 2011, Devon had 782 MMBoe of proved undeveloped reserves.
This represents a 6% decrease as compared to 2010 and represents 26% of its total proved reserves.
Drilling activities increased Devon’s proved undeveloped reserves 148 MMBoe and resulted in the conversion of 130 MMBoe, or 16%, of the 2010 proved undeveloped reserves to proved developed reserves.
Additionally, revisions other than price decreased Devon’s proved undeveloped reserves 51 MMBoe primarily due to its evaluation of certain U. S.  onshore dry-gas areas, which it does not expect to develop in the next five years.
The largest revisions relate to the dry-gas areas at Carthage in east Texas and the Barnett Shale in north Texas.
A significant amount of Devon’s proved undeveloped reserves at the end of 2011 largely related to its Jackfish operations.
At December 31, 2011 and 2010, Devon’s Jackfish proved undeveloped reserves were 367 MMBoe and 396 MMBoe, respectively.
Development schedules for the Jackfish reserves are primarily controlled by the need to keep the processing plants at their 35,000 barrel daily facility capacity.
Processing plant capacity is controlled by factors such as total steam processing capacity, steam-oil ratios and air quality discharge permits.
As a result, these reserves are classified as proved undeveloped for more than five years.
Currently, the development schedule for these reserves extends though the year 2025.
Price Revisions 2011—Reserves decreased 21 MMBoe due to lower gas prices and higher oil prices.
The higher oil prices increased Devon’s Canadian royalty burden, which reduced Devon’s oil reserves.2010—Reserves increased 72 MMBoe due to higher gas prices, partially offset by the effect of higher oil prices.
The higher oil prices increased Devon’s Canadian royalty burden, which reduced Devon’s oil reserves.
Of the 72 MMBoe price revisions, 43 MMBoe related to the Barnett Shale and 22 MMBoe related to the Rocky Mountain area.2009—Reserves increased 177 MMBoe due to higher oil prices, partially offset by lower gas prices.
The increase in oil reserves primarily related to Devon’s Jackfish thermal heavy oil reserves in Canada.
At the end of 2008, 331 MMBoe of reserves related to Jackfish were not considered proved.
However, due to higher prices, these reserves were considered proved as of December 31, 2009.
Significantly lower gas prices caused Devon’s reserves to decrease 116 MMBoe, which primarily related to its U. S.  reserves.
Revisions Other Than Price Total revisions other than price for 2011 primarily related to Devon’s evaluation of certain dry gas regions noted in the proved undeveloped reserves discussion above.
Total revisions other than price for 2010 and 2009 primarily related to Devon’s drilling and development in the Barnett Shale.
(1) Investment data has been classified based on standard industry categorizations for domestic public holdings and similar classifications by industry for all other holdings.
(2) Includes $320 million of gross unrealized gains and $68 million of gross unrealized losses as of December 31, 2010, compared to $211 million of gross unrealized gains and $133 million of gross unrealized losses as of December 31, 2009 on securities classified as held to maturity.
(3) Includes reclassifications of prior period amounts to conform to current period presentation.
(4) As of December 31, 2010 and 2009, based on amortized cost, 83% and 84%, respectively, represent Japanese government bonds held by our Japanese insurance operations, with no other individual country representing more than 8% of the balance.
(5) Includes securities collateralized by sub-prime mortgages.
See “—Asset-Backed Securities” below.
(6) Includes securities related to the Build America Bonds program.
(7) Excluded from the above are securities held outside the general account in other entities and operations.
For additional information regarding investments held outside the general account, see “—Invested Assets of Other Entities and Operations” below.
(8) The table above excludes fixed maturity securities classified as trading.
See “—Trading Account Assets Supporting Insurance Liabilities” and “—Other Trading Account Assets” for additional information.
The change in unrealized gains and losses from December 31, 2009 to December 31, 2010, was primarily due to a net decrease in interest rates, mainly the result of risk free rates.
The following table sets forth the composition of the portion of our fixed maturity securities portfolio by industry category attributable to the Closed Block Business as of the dates indicated and the associated gross unrealized gains and losses.
Fixed Maturity Securities—Closed Block Business
## Table 1 ##
(1) Investment data has been classified based on standard industry categorizations for domestic public holdings and similar classifications by industry for all other holdings.
(2) Includes securities collateralized by sub-prime mortgages.
See “—Asset-Backed Securities” below.
(3) As of both December 31, 2010 and 2009, based on amortized cost, no individual foreign country represented more than 8% of the balance.
(4) The table above excludes fixed maturity securities classified as trading.
See “—Other Trading Account Assets” for additional information.
The change in unrealized gains and losses from December 31, 2009 to December 31, 2010, was primarily due to a net decrease in interest rates, mainly the result of risk free rates.
Asset-Backed Securities Included within asset-backed securities attributable to the Financial Services Businesses are securities collateralized by sub-prime mortgages.
While there is no market standard definition, we define sub-prime mortgages as residential mortgages that are originated to weaker quality obligors as indicated by weaker credit scores, as well as mortgages with higher loan-to-value ratios, or limited documentation.
The significant deterioration of the U. S.  housing market, high interest rate resets, higher unemployment levels, and relaxed underwriting standards for some originators of sub-prime mortgages have led to higher delinquency rates, particularly for those mortgages issued in 2006 and 2007.
Recently there has been significant attention given to potential deficiencies in lenders’ foreclosure documentation, causing delays in the foreclosure process.
Many lenders have indicated that the issues are administrative and they do not expect significant delays in their foreclosure proceedings.
From the perspective of an investor in securities backed by sub-prime collateral, any significant delays in foreclosure proceedings could result in increased servicing costs which could negatively impact the value of the impacted securities.
Separately, as an investor in sub-prime securities, we are evaluating our legal options with respect to potential remedies arising
PRUDENTIAL FINANCIAL, INC.  Notes to Consolidated Financial Statements Other Guarantees
## Table 2 ##
The Company is also subject to other financial guarantees and indemnity arrangements.
The Company has provided indemnities and guarantees related to acquisitions, dispositions, investments and other transactions that are triggered by, among other things, breaches of representations, warranties or covenants provided by the Company.
These obligations are typically subject to various time limitations, defined by the contract or by operation of law, such as statutes of limitation.
In some cases, the maximum potential obligation is subject to contractual limitations, while in other cases such limitations are not specified or applicable.
Included above are $317 million and $323 million as of December 31, 2015 and 2014, respectively, of yield maintenance guarantees related to certain investments the Company sold.
The Company does not expect to make any payments on these guarantees and is not carrying any liabilities associated with these guarantees.
Since certain of these obligations are not subject to limitations, it is not possible to determine the maximum potential amount due under these guarantees.
The accrued liabilities identified above do not include retained liabilities associated with sold businesses.
Insolvency Assessments Most of the jurisdictions in which the Company is admitted to transact business require insurers doing business within the jurisdiction to participate in guarantee associations, which are organized to pay contractual benefits owed pursuant to insurance policies issued by impaired, insolvent or failed insurers.
These associations levy assessments, up to prescribed limits, on all member insurers in a particular state on the basis of the proportionate share of the premiums written by member insurers in the lines of business in which the impaired, insolvent or failed insurer engaged.
Some states permit member insurers to recover assessments paid through full or partial premium tax offsets.
In addition, Japan has established the Japan Policyholders Protection Corporation as a contingency to protect policyholders against the insolvency of life insurance companies in Japan through assessments to companies licensed to provide life insurance.
Assets and liabilities held for insolvency assessments were as follows:
## Table 3 ##
Contingent Liabilities On an ongoing basis, the Company’s internal supervisory and control functions review the quality of sales, marketing and other customer interface procedures and practices and may recommend modifications or enhancements.
From time to time, this review process results in the discovery of product administration, servicing or other errors, including errors relating to the timing or amount of payments or contract values due to customers.
In certain cases, if appropriate, the Company may offer customers remediation and may incur charges, including the cost of such remediation, administrative costs and regulatory fines.
The Company is subject to the laws and regulations of states and other jurisdictions concerning the identification, reporting and escheatment of unclaimed or abandoned funds, and is subject to audit and examination for compliance with these requirements.
For additional discussion of these matters, see “—Litigation and Regulatory Matters” below.
It is possible that the results of operations or the cash flow of the Company in a particular quarterly or annual period could be materially affected as a result of payments in connection with the matters discussed above or other matters depending, in part, upon the results of operations or cash flow for such period.
Management believes, however, that ultimate payments in connection with these matters, after consideration of applicable reserves and rights to indemnification, should not have a material adverse effect on the Company’s financial position.
Litigation and Regulatory Matters The Company is subject to legal and regulatory actions in the ordinary course of its businesses.
Pending legal and regulatory actions include proceedings relating to aspects of the Company’s businesses and operations that are specific to it and proceedings that are typical of the businesses in which it operates, including in both cases businesses that have been either divested or placed in wind down status.
Some of these proceedings have been brought on behalf of various alleged classes of complainants.
In certain of these matters, the plaintiffs are seeking large and/or indeterminate amounts, including punitive or exemplary damages.
The outcome of litigation or a regulatory matter, and the amount or range of potential loss at any particular time, is often inherently uncertain.

<table><tr><td></td><td>U.S. Onshore</td><td>Canada</td><td>North America</td></tr><tr><td>Proved undeveloped reserves as of December 31, 2010</td><td>411</td><td>420</td><td>831</td></tr><tr><td>Extensions and discoveries</td><td>118</td><td>30</td><td>148</td></tr><tr><td>Revisions due to prices</td><td>-2</td><td>-14</td><td>-16</td></tr><tr><td>Revisions other than price</td><td>-56</td><td>5</td><td>-51</td></tr><tr><td>Conversion to proved developed reserves</td><td>-68</td><td>-62</td><td>-130</td></tr><tr><td>Proved undeveloped reserves as of December 31, 2011</td><td>403</td><td>379</td><td>782</td></tr></table>
<table><tr><td></td><td colspan="4"> December 31, 2010</td><td colspan="4"> December 31, 2009</td></tr><tr><td> Industry-1</td><td> Amortized Cost</td><td> Gross Unrealized Gains</td><td> Gross Unrealized Losses</td><td> Fair Value</td><td> Amortized Cost</td><td> Gross Unrealized Gains</td><td> Gross Unrealized Losses</td><td> Fair Value</td></tr><tr><td></td><td></td><td></td><td></td><td colspan="2"> (in millions)</td><td></td><td></td><td></td></tr><tr><td>Corporate securities:</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td></tr><tr><td>Manufacturing</td><td>$7,940</td><td>$754</td><td>$66</td><td>$8,628</td><td>$8,191</td><td>$500</td><td>$142</td><td>$8,549</td></tr><tr><td>Utilities</td><td>5,566</td><td>510</td><td>42</td><td>6,034</td><td>5,773</td><td>358</td><td>78</td><td>6,053</td></tr><tr><td>Services</td><td>4,562</td><td>377</td><td>35</td><td>4,904</td><td>4,346</td><td>241</td><td>97</td><td>4,490</td></tr><tr><td>Finance</td><td>2,723</td><td>125</td><td>53</td><td>2,795</td><td>3,354</td><td>91</td><td>59</td><td>3,386</td></tr><tr><td>Energy</td><td>1,887</td><td>184</td><td>6</td><td>2,065</td><td>1,926</td><td>132</td><td>17</td><td>2,041</td></tr><tr><td>Retail and Wholesale</td><td>1,641</td><td>166</td><td>21</td><td>1,786</td><td>1,621</td><td>123</td><td>22</td><td>1,722</td></tr><tr><td>Transportation</td><td>1,349</td><td>102</td><td>19</td><td>1,432</td><td>1,430</td><td>74</td><td>42</td><td>1,462</td></tr><tr><td>Other</td><td>29</td><td>2</td><td>0</td><td>31</td><td>0</td><td>0</td><td>0</td><td>0</td></tr><tr><td>Total corporate securities</td><td>25,697</td><td>2,220</td><td>242</td><td>27,675</td><td>26,641</td><td>1,519</td><td>457</td><td>27,703</td></tr><tr><td>Asset-backed securities-2</td><td>4,570</td><td>60</td><td>701</td><td>3,929</td><td>4,602</td><td>36</td><td>1,048</td><td>3,590</td></tr><tr><td>Commercial mortgage-backed</td><td>3,615</td><td>170</td><td>6</td><td>3,779</td><td>3,662</td><td>47</td><td>47</td><td>3,662</td></tr><tr><td>U.S. Government</td><td>6,066</td><td>197</td><td>228</td><td>6,035</td><td>3,821</td><td>71</td><td>247</td><td>3,645</td></tr><tr><td>Residential mortgage-backed</td><td>2,311</td><td>129</td><td>15</td><td>2,425</td><td>2,571</td><td>117</td><td>40</td><td>2,648</td></tr><tr><td>Foreign government-3</td><td>596</td><td>90</td><td>9</td><td>677</td><td>637</td><td>69</td><td>9</td><td>697</td></tr><tr><td>State & Municipal</td><td>651</td><td>19</td><td>13</td><td>657</td><td>590</td><td>12</td><td>16</td><td>586</td></tr><tr><td>Total-4</td><td>$43,506</td><td>$2,885</td><td>$1,214</td><td>$45,177</td><td>$42,524</td><td>$1,871</td><td>$1,864</td><td>$42,531</td></tr></table>
<table><tr><td></td><td colspan="2">As of December 31,</td></tr><tr><td></td><td>2015</td><td>2014</td></tr><tr><td></td><td colspan="2">(in millions)</td></tr><tr><td>Other guarantees where amount can be determined</td><td>$324</td><td>$331</td></tr><tr><td>Accrued liability for other guarantees and indemnifications</td><td>$4</td><td>$5</td></tr></table>
<table><tr><td></td><td colspan="2">As of December 31,</td></tr><tr><td></td><td>2015</td><td>2014</td></tr><tr><td></td><td colspan="2">(in millions)</td></tr><tr><td>Other assets:</td><td></td><td></td></tr><tr><td>Premium tax offset for future undiscounted assessments</td><td>$79</td><td>$92</td></tr><tr><td>Premium tax offsets currently available for paid assessments</td><td>6</td><td>6</td></tr><tr><td>Total</td><td>$85</td><td>$98</td></tr><tr><td>Other liabilities:</td><td></td><td></td></tr><tr><td>Insolvency assessments</td><td>$39</td><td>$39</td></tr></table>

Question: What's the sum of the Other guarantees where amount can be determined in the years where Total for Other assets is greater than 0? (in million)
Answer: 655