Document Format Files
| Seq | Description | Document | Type | Size |
|---|---|---|---|---|
| 1 | 20-F | d738563d20f.htm | 20-F | 354984 |
| 2 | EX-4.1 | d738563dex41.htm | EX-4.1 | 182203 |
| 3 | EX-4.2 | d738563dex42.htm | EX-4.2 | 28466 |
| 4 | EX-4.3 | d738563dex43.htm | EX-4.3 | 28065 |
| 5 | EX-4.4 | d738563dex44.htm | EX-4.4 | 4121 |
| 6 | EX-12.1 | d738563dex121.htm | EX-12.1 | 9928 |
| 7 | EX-12.2 | d738563dex122.htm | EX-12.2 | 9927 |
| 8 | EX-13.1 | d738563dex131.htm | EX-13.1 | 4336 |
| 9 | EX-15.1 | d738563dex151.htm | EX-15.1 | 6360 |
| 10 | EX-15.2 | d738563dex152.htm | EX-15.2 | 6690188 |
| 11 | EX-15.3 | d738563dex153.htm | EX-15.3 | 1413 |
| 12 | EX-15.4 | d738563dex154.htm | EX-15.4 | 7304 |
| 13 | EX-15.5 | d738563dex155.htm | EX-15.5 | 7189 |
| 20 | GRAPHIC | g738563g19l01.jpg | GRAPHIC | 26001 |
| 21 | GRAPHIC | g738563g31r99.jpg | GRAPHIC | 77126 |
| 22 | GRAPHIC | g738563g40r06.jpg | GRAPHIC | 68612 |
| 23 | GRAPHIC | g738563g63b47.jpg | GRAPHIC | 25610 |
| 24 | GRAPHIC | g738563g64s12.jpg | GRAPHIC | 82910 |
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| 101 | GRAPHIC | g738563stamp025.jpg | GRAPHIC | 101200 |
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| 107 | GRAPHIC | g738563stamp028c.jpg | GRAPHIC | 27585 |
| 108 | GRAPHIC | g738563stamp029a.jpg | GRAPHIC | 805 |
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| 110 | GRAPHIC | g738563stamp032a.jpg | GRAPHIC | 56905 |
| 111 | GRAPHIC | g738563stamp032b.jpg | GRAPHIC | 38417 |
| 112 | GRAPHIC | g738563stamp033a.jpg | GRAPHIC | 44552 |
| 113 | GRAPHIC | g738563stamp033b.jpg | GRAPHIC | 45631 |
| 114 | GRAPHIC | g738563stamp034b.jpg | GRAPHIC | 50751 |
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| 119 | GRAPHIC | g738563stamp035c.jpg | GRAPHIC | 70747 |
| 120 | GRAPHIC | g738563stamp035f.jpg | GRAPHIC | 1154 |
| 121 | GRAPHIC | g738563stamp035g.jpg | GRAPHIC | 1159 |
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| 125 | GRAPHIC | g738563stamp037.jpg | GRAPHIC | 276324 |
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| 151 | GRAPHIC | g738563stamp049b.jpg | GRAPHIC | 10428 |
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| Complete submission text file | 0001193125-19-154789.txt | 64508473 |
Data Files
| Seq | Description | Document | Type | Size |
|---|---|---|---|---|
| 14 | XBRL INSTANCE DOCUMENT | bt-20190331.xml | EX-101.INS | 19758611 |
| 15 | XBRL TAXONOMY EXTENSION SCHEMA | bt-20190331.xsd | EX-101.SCH | 289344 |
| 16 | XBRL TAXONOMY EXTENSION CALCULATION LINKBASE | bt-20190331_cal.xml | EX-101.CAL | 183882 |
| 17 | XBRL TAXONOMY EXTENSION DEFINITION LINKBASE | bt-20190331_def.xml | EX-101.DEF | 1003982 |
| 18 | XBRL TAXONOMY EXTENSION LABEL LINKBASE | bt-20190331_lab.xml | EX-101.LAB | 1482405 |
| 19 | XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE | bt-20190331_pre.xml | EX-101.PRE | 1370649 |
IRS No.: 133235162 | Fiscal Year End: 0331
Type: 20-F | Act: 34 | File No.: 001-08819 | Film No.: 19848212
SIC: 4813 Telephone Communications (No Radiotelephone)
