Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-17-155836-index-headers.html | 2017-05-03 13:51:53 | |
| 0001193125-17-155836-index.html | 2017-05-03 13:51:53 | |
| 0001193125-17-155836.txt | 2017-05-03 13:51:53 | |
 0001193125-17-155836-xbrl.zip | 1203101 | 2017-05-03 13:51:53 |
| d376014d10q.htm | 7191256 | 2017-05-03 13:51:53 |
| d376014dex311.htm | 10297 | 2017-05-03 13:51:53 |
| d376014dex3110.htm | 10479 | 2017-05-03 13:51:53 |
| d376014dex3111.htm | 10293 | 2017-05-03 13:51:53 |
| d376014dex3112.htm | 10280 | 2017-05-03 13:51:53 |
| d376014dex3113.htm | 10393 | 2017-05-03 13:51:53 |
| d376014dex3114.htm | 10340 | 2017-05-03 13:51:53 |
| d376014dex3115.htm | 10410 | 2017-05-03 13:51:53 |
| d376014dex3116.htm | 10357 | 2017-05-03 13:51:53 |
| d376014dex3117.htm | 10393 | 2017-05-03 13:51:53 |
| d376014dex3118.htm | 10292 | 2017-05-03 13:51:53 |
| d376014dex312.htm | 10297 | 2017-05-03 13:51:53 |
| d376014dex313.htm | 10297 | 2017-05-03 13:51:53 |
| d376014dex314.htm | 10312 | 2017-05-03 13:51:53 |
| d376014dex315.htm | 10296 | 2017-05-03 13:51:53 |
| d376014dex316.htm | 10338 | 2017-05-03 13:51:53 |
| d376014dex317.htm | 10252 | 2017-05-03 13:51:53 |
| d376014dex318.htm | 10292 | 2017-05-03 13:51:53 |
| d376014dex319.htm | 10327 | 2017-05-03 13:51:53 |
| d376014dex321.htm | 2249 | 2017-05-03 13:51:53 |
| d376014dex3210.htm | 2327 | 2017-05-03 13:51:53 |
| d376014dex3211.htm | 2261 | 2017-05-03 13:51:53 |
| d376014dex3212.htm | 2272 | 2017-05-03 13:51:53 |
| d376014dex3213.htm | 2309 | 2017-05-03 13:51:53 |
| d376014dex3214.htm | 2319 | 2017-05-03 13:51:53 |
| d376014dex3215.htm | 2325 | 2017-05-03 13:51:53 |
| d376014dex3216.htm | 2336 | 2017-05-03 13:51:53 |
| d376014dex3217.htm | 2309 | 2017-05-03 13:51:53 |
| d376014dex3218.htm | 2320 | 2017-05-03 13:51:53 |
| d376014dex322.htm | 2263 | 2017-05-03 13:51:53 |
| d376014dex323.htm | 2280 | 2017-05-03 13:51:53 |
| d376014dex324.htm | 2296 | 2017-05-03 13:51:53 |
| d376014dex325.htm | 2293 | 2017-05-03 13:51:53 |
| d376014dex326.htm | 2335 | 2017-05-03 13:51:53 |
| d376014dex327.htm | 2247 | 2017-05-03 13:51:53 |
| d376014dex328.htm | 2279 | 2017-05-03 13:51:53 |
| d376014dex329.htm | 2330 | 2017-05-03 13:51:53 |
| d376014dex45.htm | 193167 | 2017-05-03 13:51:53 |
| exc-20170331.xml | 20246688 | 2017-05-03 13:51:53 |
| exc-20170331.xsd | 167325 | 2017-05-03 13:51:53 |
| exc-20170331_cal.xml | 191745 | 2017-05-03 13:51:53 |
| exc-20170331_def.xml | 1545126 | 2017-05-03 13:51:53 |
| exc-20170331_lab.xml | 1880700 | 2017-05-03 13:51:53 |
| exc-20170331_pre.xml | 1629257 | 2017-05-03 13:51:53 |
| FilingSummary.xml | 77318 | 2017-05-03 13:51:53 |
| Financial_Report.xlsx | 337507 | 2017-05-03 13:51:53 |
| R1.htm | 42158 | 2017-05-03 13:51:53 |
| R10.htm | 178357 | 2017-05-03 13:51:53 |
| R100.htm | 84823 | 2017-05-03 13:51:53 |
| R101.htm | 28676 | 2017-05-03 13:51:53 |
| R102.htm | 4512 | 2017-05-03 13:51:53 |
| R103.htm | 12008 | 2017-05-03 13:51:53 |
| R104.htm | 14865 | 2017-05-03 13:51:53 |
| R105.htm | 14382 | 2017-05-03 13:51:53 |
| R106.htm | 44681 | 2017-05-03 13:51:53 |
| R107.htm | 55672 | 2017-05-03 13:51:53 |
| R108.htm | 27106 | 2017-05-03 13:51:53 |
| R109.htm | 57842 | 2017-05-03 13:51:53 |
| R11.htm | 817152 | 2017-05-03 13:51:53 |
| R110.htm | 15875 | 2017-05-03 13:51:53 |
| R111.htm | 36125 | 2017-05-03 13:51:53 |
| R112.htm | 14123 | 2017-05-03 13:51:53 |
| R113.htm | 99853 | 2017-05-03 13:51:53 |
| R114.htm | 314720 | 2017-05-03 13:51:53 |
| R115.htm | 38978 | 2017-05-03 13:51:53 |
| R116.htm | 26466 | 2017-05-03 13:51:53 |
| R117.htm | 8237 | 2017-05-03 13:51:53 |
| R118.htm | 160752 | 2017-05-03 13:51:53 |
| R119.htm | 60018 | 2017-05-03 13:51:53 |
| R12.htm | 9631 | 2017-05-03 13:51:53 |
| R120.htm | 51156 | 2017-05-03 13:51:53 |
| R121.htm | 8877 | 2017-05-03 13:51:53 |
| R13.htm | 53611 | 2017-05-03 13:51:53 |
| R14.htm | 2212798 | 2017-05-03 13:51:53 |
| R15.htm | 550697 | 2017-05-03 13:51:53 |
| R16.htm | 65369 | 2017-05-03 13:51:53 |
| R17.htm | 234971 | 2017-05-03 13:51:53 |
| R18.htm | 51331 | 2017-05-03 13:51:53 |
| R19.htm | 115012 | 2017-05-03 13:51:53 |
| R2.htm | 237210 | 2017-05-03 13:51:53 |
| R20.htm | 116037 | 2017-05-03 13:51:53 |
| R21.htm | 365387 | 2017-05-03 13:51:53 |
| R22.htm | 20429 | 2017-05-03 13:51:53 |
| R23.htm | 181009 | 2017-05-03 13:51:53 |
| R24.htm | 964029 | 2017-05-03 13:51:53 |
| R25.htm | 417034 | 2017-05-03 13:51:53 |
| R26.htm | 7451 | 2017-05-03 13:51:53 |
| R27.htm | 379875 | 2017-05-03 13:51:53 |
| R28.htm | 211142 | 2017-05-03 13:51:53 |
| R29.htm | 917490 | 2017-05-03 13:51:53 |
| R3.htm | 257681 | 2017-05-03 13:51:53 |
| R30.htm | 47083 | 2017-05-03 13:51:53 |
| R31.htm | 2416030 | 2017-05-03 13:51:53 |
| R32.htm | 472512 | 2017-05-03 13:51:53 |
| R33.htm | 50757 | 2017-05-03 13:51:53 |
| R34.htm | 168425 | 2017-05-03 13:51:53 |
| R35.htm | 39441 | 2017-05-03 13:51:53 |
| R36.htm | 108984 | 2017-05-03 13:51:53 |
| R37.htm | 141933 | 2017-05-03 13:51:53 |
| R38.htm | 362070 | 2017-05-03 13:51:53 |
| R39.htm | 16186 | 2017-05-03 13:51:53 |
| R4.htm | 484541 | 2017-05-03 13:51:53 |
| R40.htm | 101506 | 2017-05-03 13:51:53 |
| R41.htm | 966728 | 2017-05-03 13:51:53 |
| R42.htm | 196232 | 2017-05-03 13:51:53 |
| R43.htm | 30256 | 2017-05-03 13:51:53 |
| R44.htm | 90530 | 2017-05-03 13:51:53 |
| R45.htm | 76149 | 2017-05-03 13:51:53 |
| R46.htm | 273619 | 2017-05-03 13:51:53 |
| R47.htm | 48462 | 2017-05-03 13:51:53 |
| R48.htm | 150267 | 2017-05-03 13:51:53 |
| R49.htm | 56317 | 2017-05-03 13:51:53 |
| R5.htm | 8931 | 2017-05-03 13:51:53 |
| R50.htm | 12471 | 2017-05-03 13:51:53 |
| R51.htm | 69051 | 2017-05-03 13:51:53 |
| R52.htm | 7153 | 2017-05-03 13:51:53 |
| R53.htm | 17264 | 2017-05-03 13:51:53 |
| R54.htm | 27886 | 2017-05-03 13:51:53 |
| R55.htm | 459808 | 2017-05-03 13:51:53 |
| R56.htm | 681921 | 2017-05-03 13:51:53 |
| R57.htm | 190257 | 2017-05-03 13:51:53 |
| R58.htm | 51944 | 2017-05-03 13:51:53 |
| R59.htm | 22539 | 2017-05-03 13:51:53 |
| R6.htm | 157319 | 2017-05-03 13:51:53 |
| R60.htm | 20031 | 2017-05-03 13:51:53 |
| R61.htm | 15338 | 2017-05-03 13:51:53 |
| R62.htm | 16704 | 2017-05-03 13:51:53 |
| R63.htm | 20038 | 2017-05-03 13:51:53 |
| R64.htm | 131521 | 2017-05-03 13:51:53 |
| R65.htm | 938525 | 2017-05-03 13:51:53 |
| R66.htm | 210496 | 2017-05-03 13:51:53 |
| R67.htm | 15262 | 2017-05-03 13:51:53 |
| R68.htm | 83180 | 2017-05-03 13:51:53 |
| R69.htm | 48531 | 2017-05-03 13:51:53 |
| R7.htm | 51489 | 2017-05-03 13:51:53 |
| R70.htm | 70769 | 2017-05-03 13:51:53 |
| R71.htm | 24862 | 2017-05-03 13:51:53 |
| R72.htm | 109923 | 2017-05-03 13:51:53 |
| R73.htm | 52541 | 2017-05-03 13:51:53 |
| R74.htm | 44328 | 2017-05-03 13:51:53 |
| R75.htm | 22859 | 2017-05-03 13:51:53 |
| R76.htm | 35991 | 2017-05-03 13:51:53 |
| R77.htm | 12825 | 2017-05-03 13:51:53 |
| R78.htm | 148143 | 2017-05-03 13:51:53 |
| R79.htm | 18394 | 2017-05-03 13:51:53 |
| R8.htm | 28129 | 2017-05-03 13:51:53 |
| R80.htm | 24699 | 2017-05-03 13:51:53 |
| R81.htm | 54418 | 2017-05-03 13:51:53 |
| R82.htm | 116927 | 2017-05-03 13:51:53 |
| R83.htm | 91158 | 2017-05-03 13:51:53 |
| R84.htm | 21548 | 2017-05-03 13:51:53 |
| R85.htm | 24005 | 2017-05-03 13:51:53 |
| R86.htm | 13984 | 2017-05-03 13:51:53 |
| R87.htm | 11632 | 2017-05-03 13:51:53 |
| R88.htm | 16988 | 2017-05-03 13:51:53 |
| R89.htm | 23348 | 2017-05-03 13:51:53 |
| R9.htm | 425269 | 2017-05-03 13:51:53 |
| R90.htm | 65145 | 2017-05-03 13:51:53 |
| R91.htm | 38316 | 2017-05-03 13:51:53 |
| R92.htm | 35229 | 2017-05-03 13:51:53 |
| R93.htm | 13251 | 2017-05-03 13:51:53 |
| R94.htm | 32106 | 2017-05-03 13:51:53 |
| R95.htm | 41199 | 2017-05-03 13:51:53 |
| R96.htm | 43814 | 2017-05-03 13:51:53 |
| R97.htm | 9491 | 2017-05-03 13:51:53 |
| R98.htm | 11264 | 2017-05-03 13:51:53 |
| R99.htm | 139678 | 2017-05-03 13:51:53 |
| R9999.htm | 10380 | 2017-05-03 13:51:53 |
| report.css | 2768 | 2017-05-03 13:51:53 |
| Show.js | 1411 | 2017-05-03 13:51:53 |