The following is a summary of net investment income:
## Table 0 ##
Available-for-Sale securities distributed by type were as follows:
## Table 1 ##
## Table 2 ##
(1) Represents the amount of other-than-temporary impairment (‘‘OTTI’’) losses in AOCI.
Amount includes unrealized gains and losses on impaired securities subsequent to the initial impairment measurement date.
These amounts are included in gross unrealized gains and losses as of the end of the period.
As of December 31, 2015 and 2014, investment securities with a fair value of $1.0 billion and $1.3 billion, respectively, were pledged to meet contractual obligations under derivative contracts and short-term borrowings, of which $478 million and $769 million, respectively, may be sold, pledged or rehypothecated by the counterparty.
At both December 31, 2015 and 2014, fixed maturity securities comprised approximately 84% of Ameriprise Financial investments.
Rating agency designations are based on the availability of ratings from Nationally Recognized Statistical Rating Organizations (‘‘NRSROs’’), including Moody’s Investors Service (‘‘Moody’s’’), Standard & Poor’s Ratings Services (‘‘S&P’’) and Fitch Ratings Ltd.  (‘‘Fitch’’).
The Company uses the median of available ratings from Moody’s, S&P and Fitch, or, if fewer than three ratings are available, the lower rating is used.
When ratings from Moody’s, S&P and Fitch are unavailable, the Company may utilize ratings from other NRSROs or rate the securities internally.
As of December 31, 2015 and 2014, the Company’s internal analysts rated $1.3 billion and $1.4 billion, respectively, of securities using criteria similar to those used by NRSROs.
The following table presents the total pretax impacts on our revenues and expenses attributable to unlocking for the years ended December 31:
## Table 3 ##
(1) Includes a $6 million net benefit related to the market impact on variable annuity guaranteed benefits and indexed universal life benefits for the year ended December 31, 2015.
Net Revenues Net revenues decreased $98 million, or 1%, to $12.2 billion for the year ended December 31, 2015 compared to $12.3 billion for the prior year primarily due to a decrease in other revenues, partially offset by an increase in management and financial advice fees.
Management and financial advice fees increased $140 million, or 2%, to $6.0 billion for the year ended December 31, 2015 compared to $5.8 billion for the prior year primarily due to higher asset-based fees driven by an increase in average AUM and a $39 million increase in performance fees.
Average AUM increased $2.1 billion to $653.5 billion for the year ended December 31, 2015 compared to $651.4 billion for the prior year primarily due to market appreciation and wrap account net inflows, partially offset by asset management net outflows and the negative impact of foreign currency translation.
See our discussion on the changes in AUM in our segment results of operations section below.
Distribution fees decreased $47 million, or 2%, to $1.8 billion for the year ended December 31, 2015 compared to $1.9 billion for the prior year primarily due to lower client activity.
Net investment income decreased $53 million, or 3%, to $1.7 billion for the year ended December 31, 2015 compared to $1.7 billion for the prior year due to a $76 million decrease in investment income on fixed maturities primarily due to low interest rates, a $21 million loss related to the market impact of hedges on investments and a $33 million decrease in net realized investment gains, partially offset by a $74 million increase in net investment income of CIEs.
Premiums increased $70 million, or 5%, to $1.5 billion for the year ended December 31, 2015 compared to $1.4 billion for the prior year primarily due to a 3% increase in auto and home policies in force.
Other revenues decreased $206 million, or 14%, to $1.3 billion for the year ended December 31, 2015 compared to $1.5 billion for the prior year due to a $278 million decrease in other revenues of CIEs primarily due to lower gains from changes in the fair value of real estate held in the consolidated property funds, partially offset by the impact of unlocking and higher fees from variable annuity guarantee sales in the prior year where the fees start on the first anniversary date and higher average fee rates.
Other revenues for the year ended December 31, 2015 included an $8 million favorable impact from unlocking compared to a $29 million negative impact in the prior year.
The primary driver of the unlocking impact to other revenues for the year ended December 31, 2015 was a positive impact from model updates related to our indexed universal life product, partially offset by a negative impact from lower projected gains on reinsurance contracts resulting from favorable mortality experience.
The primary driver of the unlocking impact to other revenues for the prior year was lower projected gains on reinsurance contracts resulting from favorable mortality experience.
Expenses Total expenses increased $307 million, or 3%, to $10.0 billion for the year ended December 31, 2015 compared to $9.7 billion for the prior year primarily due to an increase in benefits, claims, losses and settlement expenses.
Distribution expenses increased $40 million, or 1%, to $3.3 billion for the year ended December 31, 2015 compared to $3.2 billion for the prior year driven by higher advisor compensation due to growth in average assets under management.
Interest credited to fixed accounts decreased $45 million, or 6%, to $668 million for the year ended December 31, 2015 compared to $713 million for the prior year driven by lower average fixed annuity account balances.
Average fixed annuity account balances decreased $1.3 billion, or 11%, to $11.3 billion for the year ended December 31, 2015 compared to the prior year due to net outflows reflecting higher lapse rates and limited new sales due to low interest rates.
Distribution xpedx, our North American merchant distribution business, distributes products and services to a number of customer markets including: commercial printers with printing papers and graphic pre-press, printing presses and post-press equipment; building services and away-from-home markets with facility supplies; manufacturers with packaging supplies and equipment; and to a growing number of customers, we exclusively provide distribution capabilities including warehousing and delivery services.
xpedx is the leading wholesale distribution marketer in these customer and product segments in North America, operating 122 warehouse locations and 130 retail stores in the United States, Mexico and Canada.
Forest Products International Paper owns and manages approximately 200,000 acres of forestlands and development properties in the United States, mostly in the South.
Our remaining forestlands are managed as a portfolio to optimize the economic value to our shareholders.
Most of our portfolio represents properties that are likely to be sold to investors and other buyers for various purposes.
Specialty Businesses and Other CHEMICALS: This business was sold in the first quarter of 2007.
Ilim Holding S. A.
In October 2007, International Paper and Ilim Holding S. A.
(Ilim) completed a 50:50 joint venture to operate a pulp and paper business located in Russia.
Ilim’s facilities include three paper mills located in Bratsk, Ust-Ilimsk, and Koryazhma, Russia, with combined total pulp and paper capacity of over 2.5 million tons.
Ilim has exclusive harvesting rights on timberland and forest areas exceeding 12.8 million acres (5.2 million hectares).
Products and brand designations appearing in italics are trademarks of International Paper or a related company.
INDUSTRY SEGMENT RESULTS Industrial Packaging Demand for Industrial Packaging products is closely correlated with non-durable industrial goods production, as well as with demand for processed foods, poultry, meat and agricultural products.
In addition to prices and volumes, major factors affecting the profitability of Industrial Packaging are raw material and energy costs, freight costs, manufacturing efficiency and product mix.
INDUSTRIAL PACKAGING results for 2009 and 2008 include the CBPR business acquired in the 2008 third quarter.
Net sales for 2009 increased 16% to $8.9 billion compared with $7.7 billion in 2008, and 69% compared with $5.2 billion in 2007.
Operating profits were 95% higher in 2009 than in 2008 and more than double 2007 levels.
Benefits from higher total year-over-year shipments, including the impact of the CBPR business, ($11 million), favorable operating costs ($294 million), and lower raw material and freight costs ($295 million) were partially offset by the effects of lower price realizations ($243 million), higher corporate overhead allocations ($85 million), incremental integration costs associated with the acquisition of the CBPR business ($3 million) and higher other costs ($7 million).
Additionally, operating profits in 2009 included a gain of $849 million relating to alternative fuel mixture credits, U. S.  plant closure costs of $653 million, and costs associated with the shutdown of the Etienne mill in France of $87 million.

<table><tr><td></td><td colspan="3">Years Ended December 31,</td></tr><tr><td></td><td>2015</td><td>2014</td><td>2013</td></tr><tr><td></td><td colspan="3">(in millions)</td></tr><tr><td>Investment income on fixed maturities</td><td>$1,403</td><td>$1,479</td><td>$1,575</td></tr><tr><td>Net realized gains</td><td>4</td><td>37</td><td>7</td></tr><tr><td>Affordable housing partnerships</td><td>-18</td><td>-25</td><td>-12</td></tr><tr><td>Other</td><td>68</td><td>93</td><td>99</td></tr><tr><td>Consolidated investment entities</td><td>231</td><td>157</td><td>220</td></tr><tr><td>Total</td><td>$1,688</td><td>$1,741</td><td>$1,889</td></tr></table>
<table><tr><td></td><td colspan="5">December 31, 2015</td></tr><tr><td>Description of Securities</td><td>AmortizedCost</td><td>GrossUnrealizedGains</td><td>GrossUnrealizedLosses</td><td>Fair Value</td><td>NoncreditOTTI<sup>-1</sup></td></tr><tr><td></td><td colspan="5">(in millions)</td></tr><tr><td>Corporate debt securities</td><td>$15,750</td><td>$894</td><td>$-296</td><td>$16,348</td><td>$3</td></tr><tr><td>Residential mortgage backed securities</td><td>5,933</td><td>106</td><td>-66</td><td>5,973</td><td>-12</td></tr><tr><td>Commercial mortgage backed securities</td><td>2,400</td><td>70</td><td>-14</td><td>2,456</td><td>—</td></tr><tr><td>Asset backed securities</td><td>1,273</td><td>34</td><td>-11</td><td>1,296</td><td>—</td></tr><tr><td>State and municipal obligations</td><td>2,105</td><td>213</td><td>-28</td><td>2,290</td><td>—</td></tr><tr><td>U.S. government and agencies obligations</td><td>66</td><td>2</td><td>—</td><td>68</td><td>—</td></tr><tr><td>Foreign government bonds and obligations</td><td>218</td><td>17</td><td>-11</td><td>224</td><td>—</td></tr><tr><td>Common stocks</td><td>7</td><td>11</td><td>—</td><td>18</td><td>5</td></tr><tr><td>Total</td><td>$27,752</td><td>$1,347</td><td>$-426</td><td>$28,673</td><td>$-4</td></tr></table>
<table><tr><td></td><td colspan="5">December 31, 2014</td></tr><tr><td>Description of Securities</td><td>AmortizedCost</td><td>GrossUnrealizedGains</td><td>GrossUnrealizedLosses</td><td>Fair Value</td><td>NoncreditOTTI<sup>-1</sup></td></tr><tr><td></td><td colspan="5">(in millions)</td></tr><tr><td>Corporate debt securities</td><td>$15,742</td><td>$1,482</td><td>$-59</td><td>$17,165</td><td>$3</td></tr><tr><td>Residential mortgage backed securities</td><td>6,099</td><td>168</td><td>-60</td><td>6,207</td><td>-15</td></tr><tr><td>Commercial mortgage backed securities</td><td>2,513</td><td>120</td><td>-3</td><td>2,630</td><td>—</td></tr><tr><td>Asset backed securities</td><td>1,417</td><td>59</td><td>-6</td><td>1,470</td><td>—</td></tr><tr><td>State and municipal obligations</td><td>2,008</td><td>257</td><td>-26</td><td>2,239</td><td>—</td></tr><tr><td>U.S. government and agencies obligations</td><td>43</td><td>4</td><td>—</td><td>47</td><td>—</td></tr><tr><td>Foreign government bonds and obligations</td><td>236</td><td>21</td><td>-6</td><td>251</td><td>—</td></tr><tr><td>Common stocks</td><td>8</td><td>10</td><td>—</td><td>18</td><td>5</td></tr><tr><td>Total</td><td>$28,066</td><td>$2,121</td><td>$-160</td><td>$30,027</td><td>$-7</td></tr></table>
<table><tr><td>Pretax Increase (Decrease)</td><td>2015</td><td>2014</td></tr><tr><td></td><td colspan="2">(in millions)</td></tr><tr><td>Premiums</td><td>$-3</td><td>$—</td></tr><tr><td>Other revenues</td><td>8</td><td>-29</td></tr><tr><td>Total revenues</td><td>5</td><td>-29</td></tr><tr><td>Benefits, claims, losses and settlement expenses</td><td>-58</td><td>6</td></tr><tr><td>Amortization of DAC</td><td>15</td><td>8</td></tr><tr><td>Total expenses</td><td>-43</td><td>14</td></tr><tr><td>Total<sup>-1</sup></td><td>$48</td><td>$-43</td></tr></table>

Question: In the year with the most Corporate debt securities, what is the amount of Corporate debt securities and Residential mortgage backed securities ? (in million)